At one time, Chondrichthyes were thought to have split off from other vertebrates before the evolution of bone. Now we have concluded that the Chondrichthyes split off after the evolution of bone had started. This change demonstrates .
A) characteristics can be lost in evolution
B) evolution is one-way and straight line
C) hagfishes and lampreys have ancestors with bone
D) cartilage contributes to keeping sharks light so they do not sink
Answers
At one time, Chondrichthyes were thought to have split off from other vertebrates before the evolution of bone. Now we have concluded that the Chondrichthyes split off after the evolution of bone had started. This change demonstrates characteristics can be lost in evolution.
What is Chondrichthyes?The class of cartilaginous fishes known as chondrichthyes includes these fishes, which have skeletons predominantly made of cartilage. They can be compared to Osteichthyes, also known as bony fishes, whose skeletons are primarily made of bone tissue. Jawed vertebrates known as chondrichthyes have paired fins, paired nares, scales, and a heart with chambers arranged in series. From the 10 cm (3.9 in) finless sleeping ray to the 10 m (32 ft) whale shark, chondrichthyes are still alive today.
Elasmobranchii (sharks, rays, skates, and sawfish) and Holocephali make up the class's two subclasses (chimaeras, sometimes called ghost sharks, which are sometimes separated into their own class).
The cartilaginous fishes are unique from all other jawed vertebrates within the infraphylum Gnathostomata.
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Related Questions
what structure holds the sister chromatids to the spindle fibers
Answers
Sister chromatids are held to the spindle fibres by a structure called the kinetochore.
During cell division, sister chromatids, which are identical copies of each chromosome, need to be separated and distributed equally to the daughter cells. This process occurs during the metaphase stage of mitosis or meiosis, where the sister chromatids align at the centre of the cell along the metaphase plate. The attachment of sister chromatids to the spindle fibres is facilitated by the kinetochore.
The kinetochore is a protein structure located at the centromere region of each chromatid. It serves as the attachment site for the microtubules of the spindle fibres, allowing them to interact and exert forces that separate the sister chromatids. The kinetochore plays a crucial role in ensuring accurate chromosome segregation during cell division.
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A red bloom cell has diameter of 0.008mm. a model of the red blood cell has a diameter of 80mm. What is the scale of the model
Answers
Scale of the model: 1:10,000. To find the scale of the model, we need to compare the size of the model to the actual size of the red blood cell. Given that the diameter of the red blood cell is 0.008mm and the diameter of the model is 80mm, we can calculate the scale by dividing the diameter of the model by the diameter of the actual cell.
Scale = Model diameter / Actual cell diameter
Substituting the given values:
Scale = 80mm / 0.008mm
Simplifying the expression:
Scale = 10,000
Therefore, the scale of the model is 1:10,000.
1. Identify the diameter of the red blood cell: 0.008mm.
2. Identify the diameter of the model: 80mm.
3. Use the formula Scale = Model diameter / Actual cell diameter.
4. Substitute the values into the formula: Scale = 80mm / 0.008mm.
5. Simplify the expression to find the scale: Scale = 10,000.
6. The scale of the model is 1:10,000, indicating that the model is 10,000 times larger than the actual red blood cell.
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In order to infect cells, viruses must enter a cell and express their proteins, which can cause harm to the host cell. According to the
model shown here, what component of the virus enters the host cell and directly affects the infected cell?
es
A)
B)
(C)
D)
The capsid which is made up of proteins
The viral membrane which is made up of lipids
The genetic material, made of DNA or RNA
Both the viral membrane and the protein coat
Answers
Answer:
The genetic material, made of DNA or RNA
Explanation:
A report based on the interaction of wolves, moose, ticks, and trees on Isle Royal Describes a(n) _______.
A. Population
B. Community
C. Habitat
D. Biome
E. Ecosystem
Answers
The report based on the interaction of wolves, moose, ticks, and trees on Isle Royal describes an Ecosystem.
The report on Isle Royal's wolves, moose, ticks, and trees describes an ecosystem.
An ecosystem refers to a biological community of living organisms interacting with their physical environment. In this case, the report explores the complex relationships between wolves, moose, ticks, and trees on Isle Royal, highlighting how each organism depends on and affects the others in the ecosystem.
Wolves and moose are predators and prey, respectively, while ticks are parasites that feed on both, and trees provide habitat and food for all the organisms. The report examines the ecological balance of the ecosystem and how changes in one population can impact the others, making it a fascinating study of the delicate interdependence of nature.
Ultimately, the report showcases how studying ecosystems can offer insights into the complex dynamics of our planet's natural world and how humans can better protect and conserve it.
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WORTH 100 POINTS HELP ASAP PLEASE IT'S DUE VERY SOON
Estimate the time since death (TSD), using the information provided. Work in pairs. Assume normal temperatures and environment, unless otherwise noted. You can type in the text box, or upload your answers.
1. The body is warm to the touch. No rigor is noticeable. A small level of livor is present, but blanches. Therefore, the body has not been dead for more than __________ hours.
2. The body is warm and beginning to show signs of stiffness. The body has been dead between ____________ and _____________ hours, approximately.
3. The body is cold to the touch and stiff. The body has been dead between _____________ and _____________ hours, approximately.
4. The body is cold and not stiff. The body has been dead for more than _________ hours.
5. Once a body has been in place for some time, even 30 minutes, some hint of fixed lividity may be apparent. If any fixed lividity shows up on any surface other than the inferior one, it is an indication that at some time thirty minutes or so after death the body was moved. a) A body found with heavy fixed lividity on the upper surfaces and light but fixed lividity on the lower surfaces was moved after __________________________ hour(s) and has been in place for ________ hour(s) or more. b) A body found with equal degrees of lividity on the upper and lower surfaces was repositioned or rolled over after _________________ hours.
6. The jaw and neck are rigid but the rest of the body is limp, indicating the body has been dead for _____________ to ____________ hours.
7. Every skeletal muscle is rigid down to the legs (but not including the legs) means the body has been dead for ____________ hours.
8. The jaw is limp but from the neck down is rigid, so the time since death is approximately ________________ hours.
9. In true algor mortis in a normal environment, the body decreases temperature 2 degrees per hour in the first 6 hours, and 1.5 degrees per hour from 6 to 12 hours. Therefore, if the liver (organ) temperature was 89 degrees, the person has been dead for approximately _______ hours. What if the liver temperature is 84 degrees? Time since death would be ___________ hours.
10. Scenario 1: Only the legs are in rigor. The body is room temperature. Livor is fixed on the lower side. The person has to have been dead for at least ___________ hours.
11. Scenario 2: A woman is found with some light lividity on her front side and heavy lividity on her back side. Her roommate claims that he found her in the apartment after coming home from work and, attempting life-saving techniques on her, may have turned her over in the process. Once he could not revive her, he left her in place for a couple of hours, claiming he was too scared to call the police, who arrived within half an hour after his call. Do you buy his story? Why or why not?
12. A body is found outside in cold weather. The body itself is cold and only the legs are stiff. The body has been dead between ________ hours.
13. A body is found in a car at the end of Southern Blvd. during the summer. The windows to the car are closed. It is bloated, with marbling and dark discoloration. The body has probably been dead for at least _______ days.
14. A badly decomposed, almost skeletonized body is found on the mesa in May. Some flesh is still present on the bones, but some of it has mummified. Why is it so difficult to estimate this person’s TSD?
Answers
Answer:
1. The body is warm to the touch. No rigor is noticeable. A small level of livor is present, but blanches. Therefore, the body has not been dead for more than _______12___ hours.
The templates that CICS uses to decide what characteristics to offer temporary storage queues for the CICS region are described in the Temporary Storage Definitions (TSD).
Thus, CICS utilizes the properties of the template with the longest matching template name it can locate in the TSD when an application first establishes a temporary storage queue.
The queue immediately transforms into a nonrecoverable local queue with public access if no match is discovered. For security, recovery, and remoteness, CICS needs TSD entries.
You define generic data identifiers so that any one-of-a-kind temporary storage identification (created dynamically in a program) that starts with the same characters as a generic identifier (in the TSD) can instantly take on the same characteristics as the TSD entries.
Thus, The templates that CICS uses to decide what characteristics to offer temporary storage queues for the CICS region are described in the Temporary Storage Definitions (TSD).
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It would gain nutrients from the water in the environment.
Answers
Answer:
True?
Explanation:
What happens in meiosis I that does not occur in meiosis II?
-cytokinesis takes place
-nuclei divide
-DNA is copied
-haploid cells form
Answers
DNA replication only take place in meiosisI
Answer:
DNA is Copied
Explanation:
Hello people ~
Embryo sac is called monosporic when it develops from
a) One of the megaspores out of the four megaspores which are derived from division of megaspore mother cell
b) Three megaspores
c) Only from two functional megaspores
d) None of these
Answers
Answer:
One of the megaspores out of the four megaspores which are derived from division of megaspore mother cell
Explanation:
The main process behind this division is meiosisFirst mother megaspore divide itself into half.Then it again divides into half to form haploidOption A
What is the purpose of writing a SOAP? (choose all that
apply)
A. to create a document which does not need to ever be
modified
B. to formulate a treatment plan
C. to create a document which can be sha
Answers
SOAP stands for Subjective, Objective, Assessment and Plan. It is a format used by health care providers to document their interactions with patients.
Hence, options B and C are the correct answers.
The following are the purposes of writing a SOAP: To formulate a treatment plan (B)To create a document which can be shared with other health care providers to ensure continuity of care (C)
To formulate a treatment plan (B)To create a document which can be shared with other health care providers to ensure continuity of care (C)To provide a clear and concise documentation of the patient's medical history and current condition (A and C)To communicate effectively among health care providers (B and C)
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Look at the protons below. Which could be it's function?
A. storing energy
B. insulating the body
C. forming muscle fiber
D. directing the growth of cells
Answers
Answer:
It is c
Explanation:
C forming muscle fiber
Answer: correct answer is c
Explanation:
Not having enough resources to satisfy all one's needs and wants
economics
O scarcity
O resource
O fixed cost
Answers
Answer:
Scarcity
Explanation:
I hope this helps!
Please Mark me brainliest and have a great day!
Answer:
Scarcity
Explanation:
Scarcity means the state of being in short supply or having a shortage of something.
Hope this helps. Have a nice day you amazing bean child.
list 4 additional benefits of trees (different from what you already wrote in this lab) from this tedtalk:
Answers
In the TedTalk video, “The hidden life of trees”, the author mentioned several additional benefits of trees.
Here are four of them:
1. Trees create social benefits: Trees play a major role in creating a sense of community. They offer a natural gathering spot and can foster interaction between people. They also help to reduce crime rates by creating a sense of community ownership.
2. Trees offer health benefits: Trees are beneficial to the health of people who live in tree-lined areas. Trees help to clean the air by absorbing pollutants. This, in turn, can reduce respiratory problems such as asthma. Additionally, studies have shown that people who live in areas with more trees have lower levels of stress.
3. Trees provide economic benefits: Trees provide many economic benefits. They can help to reduce energy costs by providing shade and cooling. They can also increase property values by up to 15 percent. Trees are also used in many industries, such as furniture, paper, and construction.
4. Trees have ecological benefits: Trees play a crucial role in the ecological balance of the earth. They provide habitat for many species of animals and plants. They also help to prevent soil erosion and desertification. Finally, trees absorb carbon dioxide from the atmosphere and help to reduce the negative impact of climate change.
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4.1
Give the correct term to describe the '5000 species of fynbos that are
not found anywhere else in the world'
Answers
Have a good day
What best describes the association between the carbon cycle, plants, and animals?
Plants fix carbon and release oxygen, and animals release carbon and use oxygen.
Animals fix carbon and release oxygen, and plants release carbon and use oxygen.
Animals fix carbon through respiration, and plants fix carbon through photosynthesis.
Plants decompose fixing carbon, and animals decompose releasing carbon.
Answers
The best statement that describes the association between the carbon cycle, plants, and animals is plants fix carbon and release oxygen, and animals release carbon and use oxygen.
WHAT IS THE CARBON CYCLE?The carbon cycle is a series of processes that leads to the release and usage of carbon between biotic and abiotic factors of the ecosystem.
Plants make use of carbon in form of carbon dioxide by undergoing photosynthesis while animals make use of the oxygen released for respiration.
Therefore, the best statement that describes the association between the carbon cycle, plants, and animals is plants fix carbon and release oxygen, and animals release carbon and use oxygen.
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Question 10 of 10
Which statement best describes what would happen if you walked from point
A to point C on this topographic map?
A. You would walk downhill and then uphill.
B. You would walk across flat and level ground.
C. You would walk downhill.
D. You would walk uphill.
Answers
The statement that best describes what would happen if you walked from point is A to point C on this topographic map is You would walk downhill and then uphill.
Option A is correct.
What is a topographic map?A topographic map or topographic sheet is described as a type of map characterized by large-scale detail and quantitative representation of relief features, usually using contour lines, but historically using a variety of methods.
A topographic map contains a detailed and accurate illustration of man-made and natural features on the ground such as roads, railways, power transmission lines, contours, elevations, rivers, lakes, and geographical name.
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the manus (hands) of basal iguanadontia and hadrosauridae differ in that
Answers
The manus (hands) of basal iguanodontia and hadrosauridae differ in several ways. Basal iguanodontia refers to a group of early herbivorous dinosaurs that lived during the Early Cretaceous period, while Hadrosauridae refers to a family of duck-billed dinosaurs that lived during the Late Cretaceous period.
One of the main differences between the manus of these two groups is in the number of digits. Basal iguanodontia typically had five fingers (pentadactyl), while hadrosauridae typically had four fingers (tetradactyl). In hadrosauridae, the first digit was greatly reduced and did not touch the ground, while the second, third, and fourth digits were elongated and supported a large pad of skin known as the "duckbill".
Another important difference is in the orientation of the fingers. In basal iguanodontia, the fingers were arranged in a semi-circular pattern, with the thumb pointing inward and the other fingers pointing outward. In contrast, the fingers of hadrosauridae were arranged in a more linear fashion, with the fingers pointing straight ahead.
Finally, the structure and function of the fingers differed between these two groups. Basal iguanodontia had more robust fingers with well-developed claws that were likely used for grasping and manipulating plant material, while the elongated fingers of hadrosauridae were likely used for more specialized tasks such as stripping leaves from branches and digging for roots.
Overall, while both basal iguanodontia and hadrosauridae had manus adapted for herbivory, they differed in several important ways in terms of the number, orientation, and function of their fingers.
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Becky wanted to figure out what type of liquid worked best for growing beans. She watered
one with coca-cola, one with lemonade, and one with just water. After one week, she
measured how high they had grown.
Answers
Answer:
The one with coca-cola will surely die, the one with lemonade will have trouble, the one with water will be just fine
Explanation:
i really need ??????????????
Answers
How does the presence of mountains affect an area’s climate?
Answers
Explanation:
Mountains can have a significant effect on rainfall. When air reaches the mountains, it is forced to rise over this barrier. As the air moves up the windward side of a mountain, it cools, and the volume decreases. As a result, humidity increases and orographic clouds and precipitation can develop
What type of transport was shown here?
-passive diffusion
-because the molecules moved DOWN the concentration gradient.
-active facilitated diffusion
-because the molecules moved DOWN the concentration gradient with the help of proteins.
-passive diffusion
- because molecules moved UP the concentration gradient.
- active transport
-because the molecules moved UP the concentration gradient with the help of proteins.
Answers
Answer:
- active transport
- because the molecules moved UP the concentration gradient with the help of proteins.
Explanation:
In simple diffusion, small noncharged molecules or lipid-soluble molecules pass between the phospholipids to enter or leave the cell, moving from areas of high concentration to areas of low concentration (they move down their concentration gradient).
Answer:
- active transport
-because the molecules moved UP the concentration gradient with the help of proteins.
Explanation:
Active transport is shown here. This statement is the correct answer.
What are structural adaptations? How do these structures increase the survival rate of a species?
Answers
Answer:
Anatomical or morphological features that improve an organisms ability to cope with abiotic and biotic factors in their environment. This increases there chances of survival and reproduction
Explanation:
Is hard to swallow a symptom and is extreme fatigue a symptoms
Answers
Answer:
yes
Explanation:
Your symptoms can be related to infections that affect the neck and throat, including labyrinthitis and mumps. Other conditions may also be responsible for symptoms of this type. Fatigue can be felt with many different types of illness.
Which spheres interact in the formation of tsunamis? Check all that apply.
Answers
geosphere and hydrosphere
Answer:
The answer is Geosphere and hydrosphere. D and E <3
Explanation:
Give 3 characteristics of the FIVE phylum in chordata
Answers
Answer:
notochord, a dorsal hollow nerve cord and pharyngeal slits.
Big Question:How is energy/matter transferred throughout an ecosystem?
Answers
Answer:
Food webs can transfer energy because the proteins from an animal can go on, this benefits ecosystems.
Which of the following is the best definition of an unsaturated fatty acid? 8 A. A basic unit of a lipid that consists of single and double carbon-to- carbon bonds B. A compound that carries hereditary information C. An insoluble compound made up of glycerol and three fatty acids D. A basic unit of a lipid that consists of only single carbon-to-carbon bonds
Answers
6. What substance causes death by affecting the heart's ability to send electrical b
signals?
a. sodium pentothal
b. potassium chloride
c. arsenic
d. mercury
Answers
Potassium chloride, is the substance that causes death by affecting the heart's ability to send electrical signal.
What are electrical signals?Electrical signals are waves of energy that carry information from one place to another. They are created by the flow of electrons through a circuit, and can be analog or digital. Electrical signals are used to power and communicate with a wide range of electronic devices, from cell phones to computers also appliances.Electrical signals are a critical component of modern life, and are used in a variety of ways.
In context of the above statementPotassium chloride is a salt which, when introduced into the body, has the effect of disrupting the normal electrical flow in the heart. This can lead to cardiac arrest and death, as the heart is unable to send out the necessary electrical signals to keep itself beating.
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By interfering with the heart's ability to send electrical signals, potassium chloride results in death. It can quickly lead to cardiac arrest if injected too quickly or in a large dose at a time.
Is potassium chloride bad for human health?Overdosing on potassium chloride can lead to hyperkalemia, which may also require medical attention. Hypokalemia and hyperkalemia can cause serious health issues, such as heart and kidney failure. Anyone showing signs of either ailment ought to seek medical attention.
What is the purpose of potassium chloride?A potassium salt which is used to treat hypokalemia is potassium chloride. A white crystal or crystalline powder used in buffer solutions, fertilizers, explosives, the treatment of hypokalemia, replenishing electrolytes, and other applications.
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Explain variation and why it is important within a population or species.
Answers
Variation refers to the differences or variations that exist within a population or species.
This variation can be in physical traits, such as height, skin color, or eye color, or in behavioral traits, such as mating behavior or feeding behavior.
Variation is important within a population or species because it allows for adaptation to changing environments. Natural selection acts on this variation, allowing individuals with advantageous traits to survive and reproduce. Over time, this can lead to the development of new species or the adaptation of existing species to new environments.
Additionally, variation within a population provides genetic diversity, which is important for the long-term survival of a species. Genetic diversity ensures that a population is not vulnerable to diseases, predators, or other environmental pressures that could affect the entire population. Without variation, a population would be more susceptible to extinction.
Therefore, understanding and studying variation within a population or species is important for understanding the evolutionary processes that have shaped life on Earth and for conserving biodiversity.
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Give an overview of the process depicted in the diagram by answering the following:
What process is occurring in the image: DNA replication, transcription, or translation?
In what organelle is this process taking place: ribosome, nucleus, or chloroplast?
What molecule is used as a template in this process: DNA or RNA?
What molecule is the end product of this process: DNA, RNA, or protein?
Answers
The diagram you have provided depicts the process of DNA replication.
define dna replication ?
DNA replication is the process by which cells make a copy of their DNA prior to cell division. DNA replication is essential for the preservation and transmission of genetic information from one generation of cells to the next.
During DNA replication, the double-stranded DNA molecule is unwound and each strand serves as a template for the synthesis of a complementary new strand. The process of DNA replication is semi-conservative, meaning that each new DNA molecule consists of one original strand and one new complementary strand.
1)The diagram you have provided depicts the process of DNA replication.
2)The process of DNA replication is taking place in the nucleus of a cell.
3)DNA is used as a template in this process.
4)The end product of DNA replication is two identical DNA molecules.
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Which kingdom never has a cell wall? (1 point)
O Protista
O Plantae
O Monera
O Animalia
Answers
Answer:
What is a Protista
Explanation:
Protista. Protists are single-celled and usually move by cilia, flagella, or by amoeboid mechanisms. There is no wall cell.
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Miss Hawaii
Answer:
Your answer would be A Protista
Explanation:
These are single-celled and usually move by the cilia, flagella or by amoeboid mechanisms. For these, there is usually no cell wall, although some forms may have a cell wall.