The bar chart shows the heights of pea plants grown from 500 pea seeds.What variation do the plants show?

A. Continuous variation only
B. Discontinuous variation only
C. Both continuous variation and discontinuous variation
D. Neither continuous variation and discontinuous variation

Toxicants, such as fat-soluble DDT, when taken in by organisms from the lowest trophic level to the highest trophic level, lead to bioaccumulation and biomagnification, which results in negative ecological effects. Here's how: Bioaccumulation refers to the buildup of toxic substances in the tissues of living organisms over time.

When an organism consumes food or drinks water that contains DDT, the fat-soluble toxin accumulates in the body's fat cells. This can cause harm to the organism's health and may even cause death. The toxin can be passed from one trophic level to the next as the organisms consume each other, accumulating more and more in the process.

Biomagnification, on the other hand, is the process by which toxins become more concentrated as they move up the food chain. This is because the amount of toxin ingested increases with each step up the food chain. For example, a primary consumer such as a small fish may contain a small amount of DDT in its tissues.

When a predator such as a larger fish consumes multiple small fish, it accumulates the DDT from each of those fish. This leads to a higher concentration of DDT in the larger fish's tissues, and the process continues as the predator is consumed by a larger predator, and so on. At each step up the food chain, the concentration of DDT increases.The effects of DDT on the ecosystem are significant. It can cause reproductive problems, such as thinning eggshells, which can lead to the decline of certain bird populations.

It can also cause cancer and other diseases in animals and humans who consume contaminated food. It is essential to reduce the use of toxicants like DDT and other persistent organic pollutants to protect the environment and public health.

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Answer: Help people in need

Explanation:

Answer:

help people in need

Explanation:

Answer:

Prophase

Explanation:

The Prophase characterizes because the chromatin finishes the condensation process, which began during the final stage of the interphase.

Individual chromosomes are now visible to optic microscopy. Each chromosome is composed of two sister chromatids joined by a centromere.

During the prophase, the pares of centrioles separate, each of them migrating to opposite poles. The spindle fibers form. At this point, nucleoles have already disappeared. The nuclear membrane breaks and disappears too, and genetic material gets in contact with the cytoplasm.

Answer:

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Explanation:

The average cropland fraction for the small farms is option B) 25%.What is cropland fraction? the correct option is B) 25%.

Cropland fraction is the percentage of land used for crops or agriculture. Cropland fraction is calculated as follows: Cropland fraction = (cropland area/total land area) × 100%.Cropland fraction for small farmsCropland is land that is mainly used for agricultural production. The average cropland fraction for small farms varies according to the size of the farm. Small farms usually have a higher percentage of cropland. The average cropland fraction for small farms is around 25%.

The average cropland fraction for small farms can vary depending on the specific region and agricultural practices. However, without further information or context, it is not possible to provide an accurate average cropland fraction for small farms.

The percentage of cropland can be influenced by factors such as farm size, location, climate, crop types, and farming techniques. It can range widely from less than 10% to more than 75%, depending on these variables.

Therefore, without specific information or a defined context, it is not possible to determine the average cropland fraction for small farms.

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Option a. Sr (strontium) would have to lose two electrons in order to achieve a noble gas electron configuration.

In order to achieve a noble gas electron configuration, an atom needs to have a filled valence shell, which typically consists of eight electrons (except for helium, which has only two). The noble gases are the elements found in Group 18 of the periodic table and include helium, neon, argon, krypton, xenon, and radon.

Let's analyze each option to determine which one would have to lose two electrons to achieve a noble gas electron configuration:

a. Sr (strontium) has an atomic number of 38 and its electron configuration is [Kr]5s². To achieve a noble gas configuration, it would need to lose two electrons, resulting in an electron configuration of [Kr].

b. Na (sodium) has an atomic number of 11 and its electron configuration is [Ne]3s¹. It only needs to lose one electron to achieve a noble gas configuration, resulting in an electron configuration of [Ne].

c. Se (selenium) has an atomic number of 34 and its electron configuration is [Ar]3d¹⁰4s²4p⁴. To achieve a noble gas configuration, it would need to gain two electrons, resulting in an electron configuration of [Ar]3d¹⁰4s²4p⁶.

d. Br (bromine) has an atomic number of 35 and its electron configuration is [Ar]3d¹⁰4s²4p⁵. To achieve a noble gas configuration, it would need to gain one electron, resulting in an electron configuration of [Ar]3d¹⁰4s²4p⁶.

e. O (oxygen) has an atomic number of 8 and its electron configuration is [He]2s²2p⁴. To achieve a noble gas configuration, it would need to gain two electrons, resulting in an electron configuration of [He].

In summary, option a. Sr (strontium) would have to lose two electrons in order to achieve a noble gas electron configuration. Therefore the correct option is A

The Question was Incomplete, Find the full content below :

Which of the following would have to lose two electrons in order to achieve a noble gas electron configuration?

a. Sr

b. Na

c. Se

d. Br

e. O

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Answer:

Likewise, competition for food among deep-water fish that eat the same types of food will .

Explanation:

Natural selection will condemn all deep-sea fish to the same environment that conditions them, those that cannot develop gills will be exposed to extinction, this refers to the theory of the evolution of the fittest by Charles Darwin.

Answer:

A species of fish evolved over thousands of years to have gills that allowed the fish to swim deep in the sea. What’s the effect of this development on deep-water resources?

The fish developed the gills because of  

genetic modification

. Because the fish are now able to swim in deep water, their  

predators

in shallower water will have less food. Likewise, competition for food among deep-water fish that eat the same types of food will  

decrease

.

During photosynthesis, plants use carbon dioxide from the atmosphere to make glucose and other organic molecules in addition to oxygen. These organic molecules serve as a source of energy for the plant as well as building blocks for its growth and development.

Although plants can take up nitrogen from the soil and use it to synthesize essential chemicals such as amino acids and nucleotides, nitrogen is not produced directly during photosynthesis. In addition to being essential for plant growth, carbon is also used to make enzymes, cell walls, and other structures.

Therefore, the correct options are A and B.

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Answer:

To find out the relationship of birds from dinosaur.

Explanation:

Scientists constantly work to find out the evolution of birds from dinosaur and relationship exist between them. Scientists do hard work in order to find out the evidences that shows and confirm the relationship of birds and dinosaur. These new discoveries provides evidences about the evolution and relationship between birds from dinosaur so we can conclude that scientists constantly find out the relationship between these two organisms.

We will do the staining of an endospore bacterium.  We will do spore staining of Spore-forming bacteria include Bacillus (aerobic) or Clostridium (anaerobic) species. We will use Indian ink stain for the staining. Specially Saferin ( for gram negative ) and Crystal Violet ( for gram positive).

Because the gram-positive bacteria retain the crystal violet colour and stain purple whereas the gram-negative bacteria lose crystal violet and stain red. Thus, the two types of bacteria are distinguished by gram staining. Gram-negative bacteria are more resistant to antibodies because their cell wall is impenetrable.

The main purpose of endospores staining is to differentiate bacterial spore formers from non-spore formers. Spores are resistant to heat, dessicated chemicals and radiation. Within bacteria, endospores are protective structures used to survive extreme conditions but this protective nature makes them difficult to stain using normal techniques such as simple staining and Gram staining.

The India ink stain is used to stain capsules. Capsules appear as a well defined clear zone around the cell. Capsule formation may be evident in smears from clinical specimens, but not when the organisms are grown on most common laboratory culture media.

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Cell elongation is the main cause or result of a plant's body's growth. It is the process through which a cell enlarges as a result of hormones produced by the body.

Auxin, a hormone found in plants, aids in the growth of longer plants. It causes the tips of roots and shoots to enlarge, which lengthens stems and roots. Cell elongation, thus, contributes to the expansion of the plant's body.

The enlargement of the vacuole is primarily responsible for plant development. This is followed by cell division, which creates new cells that are nearly the same size as the original one. This results in cytoplasmic growth, which only slightly increases the size of the organ. Water.

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Answer:

option A

Explanation:

Whether it’s Asexual or sexual Reproduction, 100 percent genes move forward.

I hope this helped!

Answer:

creativity, curiosity, Logical

Answer:

The correct answer is - B. Homeostasis.

Explanation:

Homeostasis is the automatic control system that maintains optimal conditions for enzyme action in the complete human body, and other important functions such as hormonal response and others.

In the human body, homeostasis includes the control of temperature, pH, ions, and blood sugar with help of various enzymes, hormones, and sensory organs.

Answer:

Homeostasis

Explanation:

Answer:

I hope this helps.

Explanation:

Answer:

true

Explanation:

Answer:

My Game is José Fernando Tengo 12 YEARS OLD

The environmental changes caused by rising sea levels have the potential to alternately increase and decrease the biodiversity of marsh habitats.

Sum total of all the varieties of living organisms in a particular space, is known as its biodiversity.

As the sea levels steadily rose, it will firstly increase the biodiversity of marsh habitats, but sea level constantly rising, will affect its biodiversity, and organism that is native to marshy habitat should be eliminated while those organisms that are able to survive in inland habitat will migrate into it, overall causing the decrease meant of biodiversity of marshy habitat.

Therefore, the environmental changes caused by rising sea levels have the potential to alternately increase and decrease the biodiversity of marsh habitats.

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Most mammals have evolved to mate during the springtime because it is the optimal time for reproduction. During the winter months, there is a scarcity of resources and extreme weather conditions which can make it difficult for animals to survive. Additionally, the shorter days during winter can result in increased levels of the hormone melatonin, which promotes sleep and can suppress sexual activity.

In contrast, during the spring, animals have access to an abundance of resources and longer daylight hours, which can increase the levels of the hormone cortisol and reduce the levels of melatonin. This can lead to increased activity levels and heightened sexual behavior.

Leptin, another hormone, also plays a role in regulating reproductive function. High levels of leptin can stimulate reproductive function, while low levels can inhibit it. In the spring, when food is plentiful, animals are more likely to have higher levels of leptin, which can contribute to increased sexual activity.

As for human males, their preference for morning sex may also be related to hormonal factors. Testosterone levels are typically highest in the morning, which can lead to increased sexual desire and arousal. Additionally, the release of oxytocin, a hormone that promotes bonding and attachment, can also be heightened during sex, which may contribute to a positive start to the day.

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Answers

sorry

Explanation:

im sooooooo sorry

Answer:

its the cytoplasm I believe

Some species boast armature such as thorns, or spines that ward off slavering herbivores. Some are loaded with poisons to sicken or kill them. And while tomatoes may not be able to scream, as L. Ron Hubbard once claimed, some plants do emit compounds that warn their compatriots of approaching threats: the botanical equivalent of a smoke signal.

Answer:

Nitrogen Fixation

It is carried out mainly by nitrogen-fixing bacteria, which secrete enzymes needed for the process. Some nitrogen-fixing bacteria live in soil. Others live in the root nodules of legumes such as peas and beans. ... They convert nitrogen gas to nitrate ions that algae and other aquatic producers can use.

Explanation:

Fossil fuel is an exhaustible natural resource because fossil fuel requires millions of years to frame from the dead vegetation and animals that get buried deep inside the earth.

It requires high temperatures and pressure for the formation of resources that can't be provided in the laboratory or any other place.

It is a conventional source of energy. and it takes millions of years to make

their energy comes from the energy produced by the plant and animals.

In, other words, they are the remains of decomposed of plants and animals

Examples of fossil fuels are crude oil and coal.

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High genetic diversity increases the adaptability of species and causes speciation, therefore higher species diversity. High species diversity of plants indicates higher habitat diversity because plants are habitats for many species. High habitat diversity also increases the species diversity.

Genetic diversity is defined as the sum total of all the alleles in a population. More are the alleles more is the genetic diversity. High genetic diversity is necessary to resist diseases, changes in climate and other stresses.

Species diversity is the presence of various species in an ecosystem. The relative abundance is also considered in case of species diversity. When all the species are equally abundant then the diversity is highest.

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Answer:

Explanation:

To make more money and to have a better economy as a country together

Answer: They want to make sure that there is a steady supply at a reasonable price so they can use the oil that they need.

Explanation:  

As a cartel, the OPEC+ member countries collectively agree on how much oil to produce, which directly impacts the ready supply of crude oil in the global market at any given time. OPEC+ subsequently exerts considerable influence over the global market price of oil and, understandably, tends to keep it relatively high in order to maximize profitability.

If OPEC+ countries are unsatisfied with the price of oil, it is in their interests to cut the supply of oil so prices rise. However, no individual country actually wants to reduce supply, as this would mean reduced revenues. Ideally, they want the price of oil to rise while they increase supply so that revenues also rise. But that is not market dynamics. A pledge by OPEC+ to cut supply causes an immediate spike in the price of oil. Over time, the price reverts back to a level, usually lower, when supply is not meaningfully cut or demand adjusts.

Conversely, OPEC+ can decide to boost supply. For instance, on June 22, 2018, the cartel met in Vienna and announced that they would be increasing supply.3  A big reason for this was to offset the extremely low output by fellow OPEC+ member Venezuela.

Saudi Arabia and Russia, two of the largest oil exporters in the world who both have the ability to increase production, are big proponents of increasing supply as that would increase their revenues. However, other nations, who cannot ramp up production, either because they are operating at full capacity or are otherwise not allowed to, would be opposed to this.

Answer and Explanation:

Crossing over is the switching of genetic material (DNA), which occurs in Prophase 1.

This all happens in Meiosis, which is the process of the formation of sperm and egg cells.

The paired chromosomes from each parent align so that similar DNA sequences from the paired chromosomes cross over one another.

#teamtrees #WAP (Water And Plant)

Answer:

The type of tissue that covers the body surface, lines organs and cavities is called epithelial tissue or epithelium. It forms the covering on all internal and external surfaces of your body, lines body cavities and hollow organs, and is the major tissue in glands.

Biological science is simply all over the place. Biology includes you as a living being. So, if you want to know how a human body, or any other living entity, works, biology is the way to go.

It's the greatest and most accurate approach to comprehend your surroundings.

The primary goal of laboratory work in science education is to offer students with conceptual and theoretical information to assist them in learning scientific concepts and understanding the nature of science through scientific procedures.

The study of different organs and parts of an animal or plant allows us to understand the systems involved in diverse functions such as reproduction, metabolism, food collection, and behavior.

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Answer:

Besides wildfires, human settlements affect neighboring ecosystems through biotic processes, including exotic species introduction, wildlife subsidization, disease transfer, landcover conversion, fragmentation, and habitat loss.

O Dew will form on leaves.

The dew point is the temperature at which water vapor in the air will condense into liquid droplets. It is a measure of the amount of moisture in the air. The higher the dew point, the more moisture in the air. The dew point temperature is determined by the air temperature and the amount of water in the air. When air cools, its capacity to hold moisture decreases. If the air cools to its dew point, the excess moisture condenses, forming dew.

In the morning, the temperature on the ground is often more excellent than the temperature in the air. As the sun rises, the ground warms up, and the air above it cools. As the temperature drops to the dew point, the moisture in the air condenses on surfaces such as leaves, blades of grass, and other outdoor surfaces that are at or near the dew point temperature.

The statement "Air will contain more water vapor" is incorrect, as dew forms when the air can no longer hold its moisture and the excess water vapor condenses.

The statement "Clouds will disappear" is not correct, as dew formation is a phenomenon related to the condensation of water vapor, and clouds are formed by the same process, but at higher altitudes. "Water vapor in the air will evaporate" is also not correct, as the temperature dropped to the dew point, which is the point where the water vapor condenses, not evaporates.

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