What element of evolution did Charles Darwin not fully understand?
A.
how DNA contributes to evolution
B.
how advantageous traits spread
C.
how animals compete for food
D.
how animals deal with predators

Answer:

2.  It is carried by your red blood cells through your blood stream.

Explanation:

The oxygen in inhaled air passes across the thin lining of the air sacs and into the blood vessels. This is known as diffusion. The oxygen in the blood is then carried around the body in the bloodstream, reaching every cell.

It is untrue to say that the skin lacks sensory receptors and is therefore unable to respond to stimuli because the cells of the epidermis are not alive.

All layers of skin have sensory receptors. Mechanoreceptors around hair follicles, Pacinian corpuscles, Meissner corpuscles, Merkel complexes, Ruffini corpuscles, and C-fiber LTM are among the six types that can detect harmless stimuli in the skin (low threshold mechanoreceptors). Meissner's corpuscles, also known as tactile corpuscles, are a particular class of mechanoreceptor that react to touch. These are present on the skin of the lips, fingers, and other places. Nerve endings can be found in both the dermis and epidermis. These communicate information about pressure, temperature, and sensation (such as pleasure or pain). The fingertips, for example, have more of these nerves than other parts of the body.

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The main hormones in the female reproductive system that are involved in this system are estrogen, progesterone, and testosterone.

Estrogen is the primary female sex hormone and is responsible for the development and maintenance of the female reproductive system and secondary sex characteristics. It is also responsible for the regulation of the menstrual cycle, the release of eggs from the ovaries, and the development of breasts and other body parts.

Progesterone is another important hormone in the female reproductive system. It is produced by the ovaries and helps to regulate the menstrual cycle by preparing the uterus for implantation of a fertilized egg. It also helps to maintain the lining of the uterus and is involved in the development of the placenta during pregnancy.

Testosterone is a hormone found in both men and women. In women, it is produced in small amounts by the ovaries. It plays a role in libido and helps to regulate the development of secondary sex characteristics. It is also involved in the regulation of the menstrual cycle and the production of eggs from the ovaries.

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1) The term forearm is used in anatomy to distinguish it from the arm, which is most commonly used to denote the entire upper limb appendage but technically only refers to the upper arm area, whereas the lower "arm" is termed the forearm. Note that the Bat's forearm is used to flap it's wings. This is significantly different from how the human forearm is used.

2) i) Yes, they all share a common ancestor.

ii ) All of the creatures you mentioned, including humans, turtles, bats, and whales, had a common ancestor in the animal kingdom. They are all vertebrates, which means they have a backbone and an internal skeleton, and they are all members of the superphylum Deuterostomia. The evolutionary path that led to each of these species branching from a shared ancestor, however, would be distinct.

For example, bats and whales have a common ancestor that is distinct from humans and turtles.

The three-domain concept established by Carl Woese in 1990 is the tree of life that most taxonomists now accept.

The initial, most ancient, and most fundamental division of the tree of life, according to this, is into three domains: Archaea, Bacteria, and Eukarya. Archaea are ancient single-celled creatures that were formerly thought to live solely in harsh environments such as salt lakes, but are now known to be exceedingly ubiquitous.

However, it turns out that global shared ancestry has never been thoroughly investigated. Instead, the scientific community has universally accepted it to be accurate.

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Answer:

The melanocytes: these produce melanin, the pigment that provides the skin with its color and protects it from the sun's rays.

The keratinocytes: these form epidermal keratin.

Explanation:

Answer:

The nervous system influence the respiratory system by regulating breathing rate.

Explanation:

The respiratory system is controlled by the nervous system, which consists of two branches - the sympathetic and parasympathetic nervous systems. In addition the respiratory centers of the brainstem is responsible for the regulation of breathing patterns.

Pathogenic streptococci of the upper respiratory tract (such as streptococcus pyogenes) are distinguished from non-pathogenic streptococci by beta-hemolytic activity. Option A is the correct answer.

Pathogenic streptococci of the upper respiratory tract, such as Streptococcus pyogenes, are distinguished from non-pathogenic streptococci by their beta-hemolytic activity.

This means that they are able to lyse red blood cells and produce a clear zone around the colony on blood agar plates.

Non-pathogenic streptococci, on the other hand, may display alpha-hemolytic activity, which results in a greenish discoloration around the colony, or no hemolytic activity at all.

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The question is -

Pathogenic streptococci of the upper respiratory tract (such as Streptococcus pyogenes) are distinguished from non-pathogenic streptococci by

a. beta-hemolytic activity.

b. no hemolytic activity.

c. alpha hemolytic activity.

d. the presence of a lysogenic phage.

e. the absence of a capsule.

Pathogenic streptococci of the upper respiratory tract, such as Streptococcus pyogenes, are distinguished from non-pathogenic streptococci by their ability to cause disease.

This is due to their production of specific virulence factors and content loaded pathogenicity islands that allow them to colonize and invade the host's tissues. In contrast, non-pathogenic streptococci do not possess these virulence factors and do not cause disease. Therefore, it is important to identify and differentiate these two groups of streptococci in order to effectively diagnose and treat infections caused by pathogenic streptococci.

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It is a biological process by which living things create offspring that are genetically identical to them. The continuation of many species on Earth is ensured via reproduction.

Reproduction ensures the species' survival and prevents it from going extinct. Due to the genetic recombinations it causes, it contributes to evolution. It contributes to the ecosystem's ability to support more species.

It is generally agreed upon that sexual reproduction is preferable to asexual reproduction. This is due to the fact that in asexual reproduction, a single parent produces an identical offspring by passing on its genetic makeup to the offspring.

As reproduction is not necessary to maintain life, it is not considered to be a living process. An individual organism can survive without reproduction even though reproduction is necessary to preserve an organism's lineage. A trait or quality that all living things share is reproduction.

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Complete question; Which advantage of reproduction does the graph show?Explain.

A point source is a single, identifiable source of pollution, such as a pipe or a drain.

Point-source pollution is defined as contamination that comes from a single, distinguishable source, such as a manufacturing discharge pipe or sewage treatment facility. Nonpoint-source pollution is contamination that is the result of several sources, or points.

Point sources or scattered sources are both responsible for water pollution. A pipe or channel, such as one used for sewage discharge from a city sewer system or an industrial site, is referred to as a point source. Various contaminants can come from a very large, unconstrained area known as a scattered (or nonpoint) source.

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The left anterior descending artery is most likely affected by coronary artery disease.

Coronary artery sickness is due to plaque buildup inside the wall of the arteries that deliver blood to the heart (referred to as coronary arteries). Plaque is made up of cholesterol deposits.

Coronary heart ailment cannot be cured however treatment can assist manipulate the signs and decrease the possibilities of troubles including heart attacks. remedy can encompass: way of life changes, which includes everyday workout and preventing smoking.

A very blocked coronary artery will cause a coronary heart attack. The classic symptoms and signs of a coronary heart assault encompass crushing chest pain or strain, shoulder or arm ache, shortness of breath, and sweating.

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Answer:

Help maintain water and balance

Explanation:

the answer is a

This statement is not entirely true. Personal values and work values can be related, as a person's values often influence their career choices and satisfaction in their work.

How are personal and work values related?

For example, an individual who values sustainability may choose to work for a company that is focused on environmental conservation, or someone who values helping others may choose a career in healthcare.

Additionally, a person's work environment can also shape and influence their personal values. For example, a person who works for a company that prioritizes ethical behavior may begin to adopt similar values and apply them in their personal life.

In general, personal values and work values can have a reciprocal relationship, where a person's values influence their work and their work can shape and influence their personal values.

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Answer:

certain aspects are different in eukaryotes and bacteria- expression vector is a cloning vector that contains a highly active bacterial promoter just upstream of a restriction site

expressing cloned eukaryotic genes in bacteria is the presence of non coding regions- using cDNA

Explanation:

Cellular respiration is a very important process for organisms because it is from it that part of the energy necessary for survival is generated.

In respiration, we consume oxygen and glucose and form carbon dioxide, energy, and water as products.

Therefore, we can say that the reactants of cellular respiration are oxygen and glucose. Therefore, option "D" is the answer.

Answer: D.Homologous structures

Explanation:

Answer:

The cell must replicated DNA because when the cell divides, the daughter cells must have identical copies of DNA. DNA replication occurs in the S phase during interphase of the cell cycle.

Answer:

Those gases can only cross cell membranes when they are dissolved in water or an aqueous solution, thus respiratory surfaces must be moist.

Respiratory surfaces in both human beings and plants have several characteristics that are peculiar and similar to each other. There are some requirements to be met for gaseous exchange to occur.

Two characteristics that the respiratory surface used for gaseous exchange in human beings has in common with the respiratory surface used in flowering plants include ---

1.  Respiratory surface must be thin and allow for rapid diffusion.

2. These surfaces must be in contact with air or fluid.

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Option 2 is the correct one , Antidiuretic hormone (ADH), which is produced in the hypothalamus and transported to and released from the posterior pituitary gland, is a polypeptide hormone. ADH's main function is to control how much water is expelled by the kidneys.

ADH, sometimes referred to as vasopressin, enables the kidney tubules to directly reabsorb water, which concentrates salts and wastes in the urine that hypothalamus  will eventually be expelled. Either through controlling blood volume or the amount of water in the circulation, the hypothalamus regulates the processes of ADH production. A rise in osmolarity exceeding 300 mOsm/L due to dehydration or physiological stress can increase ADH production and water retention, which in turn elevates blood pressure.

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Anabolic pathways have which of the following characteristics:

Anabolism is the process of synthesizing small chemical molecules into larger molecules while catabolism is the process of breaking down large molecules into smaller molecules.

Anabolic reactions reduce the entropy of the environment and organisms, whereas catabolic reactions increase the entropy of the environment and organisms.

Anabolic reactions help make polymers so energy is needed. Catabolic reactions are the opposite of anabolic reactions, i.e. produce monomers from polymers, which produce energy.

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The type of glial cell responsible for filtering blood to produce cerebrospinal fluid (CSF) at the choroid plexus is known as Ependymal cells. A choroid plexus is a network of specialized capillaries located within the ventricles of the brain, which is responsible for the production of cerebrospinal fluid.

It is lined with specialized epithelial cells known as ependymal cells, which are responsible for the filtration of blood to produce CSF.

Ependymal cells are specialized glial cells that line the ventricles of the brain and the central canal of the spinal cord. These cells are responsible for the production of cerebrospinal fluid (CSF) by filtering blood at the choroid plexus. They are also involved in the circulation and distribution of CSF within the brain and spinal cord.

CSF is a clear, colorless fluid that surrounds the brain and spinal cord, providing a cushioning effect and serving as a nutrient-rich medium for nerve cells. It is produced in the ventricles of the brain by the ependymal cells of the choroid plexus.

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Answer:

It could be the cell from animals.

Answer:

A little girl is playing with her dog with a ball.

An old woman (I could be wrong, it could be the 'mother')brought some drinks to the family.

A man (or the father) is reading a newspaper on his chair by the desk.

A little boy is playing with his grandparents.

Explanation:

if this is not correct, please tell me

Answer:

In the n=1 energy level, the atom has 2 electrons

Explanation:

Electrons orbit the nucleus of an atom in multiple rings (energy levels). The first ring of the electron can only hold 2 electrons. After that, electrons are added to the second ring. Excluding the first ring, all other rings can hold a maximum of 8 electrons.

For example, Oxygen is an atom with 6 electrons. The first energy level contains 2 electrons, and the second energy level contains 4 electrons. The second energy level has room for up to 4 more electrons.

In your example of an atom with 15 electrons, there would be 2 electrons in the first ring, 8 electrons in the second ring, and 5 electrons in the third and final ring.

To summarize, all atoms have a first energy level containing 2 electrons, and all other energy levels can contain 8 electrons. This is true no matter the number of electrons.

In light adaptation, phototransduction does not occur in the retinal regions outside of the fovea. This is a false statement. Phototransduction occurs in all parts of the retina, including the fovea and retinal regions outside of the fovea.(option d)

Rhodopsin is stimulated in rods during dark adaptation. In light adaptation, rhodopsin becomes bleached as a result of exposure to bright light, leading to decreased sensitivity of the rods. Hence, b is not a correct answer.The iris circular muscle contracts during bright light and dilates in low light to control the amount of light entering the eye.

Therefore, the correct answer is option e. That is, in light adaptation, rhodopsin is stimulated in rods and the iris's circular muscle relaxes. During light adaptation, rhodopsin becomes bleached as a result of exposure to bright light, leading to decreased sensitivity of the rods, and the iris circular muscle relaxes. Answer: In light adaptation, rhodopsin is stimulated in rods, and the iris's circular muscle relaxes.

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If I remember correctly Robert Hooke made Sir Issac Newton mad by calling him a cheater (or something like that). Newton retaliated by stealing Hooke’s portrait.

Sorry if this is wrong