Why is the arctic fox a natural selection? Urgent need!!!

The result of natural selection.

If there were other colors of fur and were active on the ice, they would have been discovered by other predators and hung up, so that all that was left would be individuals of the same color as the ice and snow.

The survival of the fittest is the survival of the fittest. Although the arctic fox has no natural predators, the rules of nature will limit their growth and reproduction, so that's it. ...Natural Selection.

Because arctic foxes are natural creatures.

Natural selection, also known as "natural elimination", is the name of "the origin of species". The main mechanism of the evolutionary process in Darwin's theory. It is one of the factors that can lead to the divergence of genetic characteristics in populations.

Competition for food and space, as well as action on predators, can affect the composition of a certain population, with the result that those organisms that mutate favorably to their surroundings survive and those that mutate unfavorably are eliminated. Darwin called the process of survival of the fittest and the elimination of the unfit in this struggle for survival natural selection.

Therefore, there are environmental factors to have natural selection.

Environmental impact is a prerequisite for natural selection.

For example, the arctic fox can live in the Arctic because its silver-white fur blends with the local ice and snow environment and survives first.

In nature, the process of survival of the fittest and the elimination of the unfit is more natural than natural selection. Although the elimination of the unfit is also an environmental influence, this impact is too great and too strong to survive and be eliminated.

The environment has an impact on living things all the time, but most of the effects do not have serious consequences for living things, because living things have a certain ability to adapt and withstand some adverse disturbances.

a. The arctic fox lives in the cold Arctic region, and the ears of the arctic fox are very small to reduce the loss of heat, which is the adaptation of the arctic fox to the cold environment, so this option does not meet the topic;

b. The lack of Arctic food is not directly related to the very small ears of the Arctic fox, so this option is in line with the topic;

c. The result of heredity and variation, the very small ears of the arctic fox are determined by the genetic material, which is a mutation that can be inherited, so this option does not meet the topic;

d. As a result of natural selection, organisms adapt to the environment, and the Arctic fox has adapted to the cold environment of the Arctic in order to survive, which is the survival of the fittest, that is, natural selection, so this option does not meet the topic

Therefore, choose B

a. The arctic fox lives in the cold Arctic region, and the ears of the arctic fox are very small to reduce the loss of heat, which is the adaptation of the arctic fox to the cold environment, so this option does not meet the topic;

b. The lack of Arctic food is not directly related to the very small ears of the Arctic fox, so this option is in line with the topic;

c. The result of heredity and variation, the very small ears of the arctic fox are determined by the genetic material, and they are hereditary variations, so this option does not meet the topic;

d. As a result of natural selection, the organism adapts to the environment, and the Arctic fox has adapted to the cold environment of the Arctic in order to survive, which is the survival of the fittest, that is, the noisy natural selection, so the option does not conform to the theme of slow air waiting

Therefore, choose B

It's a very cold climate.

The ears are used to dissipate heat, and the Arctic is very cold, so in order to survive, the ears of animals should be relatively small.

Arctic foxes can live on ice sheets as low as -50 degrees Celsius.

If the ears are large, the heat dissipation effect will be increased, so near the equator, the ears will be large. In order to reduce the consumption of organic matter, the arctic fox needs to dissipate less heat.

The climate is very cold.

Generally, animals with fur have the following ways to dissipate heat: tongue (dogs, etc.), ears (many capillaries, fast heat dissipation).

The arctic fox belongs to the canine family, with a narrow frontal surface, a pointed snout, round ears, fluffy tail hair, and a white tip.

Foxes are the true masters of the Arctic steppes, not only have they lived here for generations, but they have few natural predators other than humans. Therefore, before the fur traders from the outside world reached the North Pole, the foxes lived freely and carefree. They may not be able to attack large herbivores such as reindeer, but they can catch small birds, collect eggs, hunt rabbits, or catch mollusks on the seashore to feed their hunger.

In autumn, they can also change their tastes and go to the grass to find a little berry to eat to replenish the vitamins that the body needs.

The main food of the fox is still from lemmings. When encountered, the Arctic Fox will jump up with great accuracy, then pounce on it, pinning it to the ground and devouring it. Interestingly, when the arctic fox smells the lemmings in the nest and hears the lemmings' screams, it will quickly dig the lemmings' nest under the snow, and when it is almost done, the arctic fox will suddenly jump high, and with the strength of the jump, use its legs to collapse the snow nest, and kill the nest of lemmings one by one, eating them one by one.

The number of arctic foxes fluctuates with the fluctuation of the number of lemmings, and usually, the peak year of a large number of lemmings is the peak year of the arctic fox population, and the arctic fox begins to leave for a living; At this time, the fox colony will inexplicably prevalence of a disease called "mad dancing disease". This disease is caused by the invasion of the nervous system by the virus, and the diseased arctic fox will become extremely excited and excited, often unable to control itself, running around, and even daring to attack passing dogs and wolves. Most of the sick people died in the first winter, with as many as two carcasses per square kilometre, and local hunters lived to take foxes from their furs.

Arctic foxes are covered in long, fluffy, thick fur that allows them to live comfortably even when temperatures drop to -45, so they can survive the rigors of the Arctic for generations. Although people do not have a good impression of the fox itself, they are well aware of the value and wonderful use of fox fur, and the people of high dignitaries and dignitaries with thousands of pockets are proud to wear fox fur coats, and the scenery is infinite. The quality of fox fur is also good and bad, the further north, the better the fur quality, the softer the fur, the higher the value, therefore, the Arctic tung fox has naturally become the target of people to hunt.

It is a protective color, and in the long process of evolution, in order to adapt to the white environment of the Arctic ice and snow, it was formed like a grasshopper in the grass is green.

The back of the fish is black.

A truth.

The result of natural selection.

If there were other furs and they were moving on the ice, they would have been discovered by other predators and hung up, so that all that was left would be individuals of the same color as the ice and snow.

B is the mimic state, C is the protective color, D is a kind of prevention of natural enemies of animals, and it also belongs to the adaptation of organisms to the environment.

Choose A. The presence of altitude sickness indicates that the environment is not adapted.

a, if you adapt to the environment of the cultivation hand, you can avoid the natural stove to disturb the enemy, and better survive in the hidden middle of the Dan, such as the body color of the arctic fox is close to white, the bamboo insect is like a bamboo, and the grass lizard automatically cuts off its tail when it encounters the enemy, which is similar to the surrounding living environment to confuse the natural enemy, and avoid the natural enemy to better survive and reproduce.

Altitude sickness is an adverse reaction of the body that occurs when people go to a plateau and cannot adapt to the surrounding environment.

Choose A. Because b, c, and d are all about mimicry, protective color, etc., in the diversity of organisms adapting to the environment, while a is different.