Survival of the fittest! Animals, don t be too hard to find

Birch moth body. The birch moth will change color.

The most typical example of adaptation in biology is the birch moth in industrial areas"Blackening"phenomenon. Birch moth.

It is a moth that lives in Europe. The normal body color of the birch moth is grayish-white, it is nocturnal and inhabits the trunk of a tree during the day, its body color is very similar to the color of the lichen on the trunk, and it is not easy to be preded.

Found by birds. In the 19th century, British industrialization caused serious pollution, and the large chimneys emitted a large amount of soot, killing.

The light gray lichen on the dead trunk turned the trunk of the tree that had been densely covered with lichen black. Thus changed the birch.

The inchmoth's habitat has been exposed in a new environment. So, ash.

The white birch moth became easier to spot and prey on by birds, while the black variety, which used to be easy to spot, did.

To the cover. Under the influence of natural selection, the black type gradually replaced the light type. In industrial black.

Under the influence of the mutin, the black birch moth adapted to the new environment and was preserved since 1850 people.

The first black birch moth was found, and by the end of the 19th century, the black type accounted for more than 95%, while the light gray type.

The type was dropped from 99% to less than 5%. It can be seen that the adaptation of organisms to the environment is the most important thing for their survival.

Be sure. The so-called protective color, warning color, and mimicry are all manifestations of biological environment adaptation.

Nature is ever-changing; Adaptation is relative; The fittest in one environment, in another.

The environment may become uncomfortable and be eliminated.

The traits that help the individual living and reproduction of the organism are passed on to the offspring, while the unfavorable traits are eliminated.

Survival of the fittest is an integral part of Darwin's theory of natural selection, which holds that natural selection weeds out those who are less adapted to their environment and allows those who are best adapted to their environment to be preserved and thriving. The most adaptable person in the competition for survival ensures his chances of survival.

There is controversy as to whether all survivors are the fittest. Natural selection or species evolution, i.e., traits that help an organism individual survive and reproduce are passed on to future generations, while unfavorable traits are eliminated.

Genes are not directed mutations, and then there are different genes that express different traits, and then according to environmental changes or different traits are eliminated from organisms that are not adapted to the environment.

The natural environment has a certain selectivity towards animals, and only animals that adapt to the environment will be able to survive.

It can change the body so that it can adapt to the environment and survive.

It's the best animals that survive! I don't know the specifics. Look at something else!

Ecological questions.

One of the ideas in Darwin's theory of evolution is that individuals who adapt to their environment (with excellent genes) can survive, and individuals who cannot adapt to their environment die. In this way, excellent genes are inherited, other genes are eliminated, and organisms can evolve in the survival of the fittest from generation to generation.

For example, once upon a time, giraffe populations had necks of varying lengths. When the species reaches a certain stage, the number of individuals in the population reaches a certain level, and there is a shortage of food. The leaves of the short trees in the forest are eaten and can only eat the leaves of the taller trees, and the giraffes with longer necks are more likely to survive, and the individuals with short necks die and their genes cannot be inherited.

In this way, the survival of the fittest from generation to generation ends up with long necks of giraffes.

The ancestors of giraffes are not all long-necked, and some of them are short-necked, and both kinds of giraffes can survive when the pie food is abundant, but when the grass is scarce, the long-necked giraffe can eat the leaves that grow in high places with raw socks, so as to live, while the short-necked giraffes starve to death because they can't reach the leaves in high places, so that gradually the giraffe's neck is long.

This is natural selection, survival of the fittest.