用进废退的英语作文

\"Use into the waste and retreat\"is very reasonable at the individual level，often\"use\"，that is，practice，will make the skills improve，and a long time of waste，will let the skills unfamiliar。From this point of view，the truth of\"using into waste and retreat\"is very similar to\"practice makes perfect\"and\"three days without practice\"。

Evolutionary theory unremittingly explores，\"How did species diversity form？\"，\"Where does the difference between current animals and their ancestors come from？——variation is not generated randomly generated，but determined by the environment and the will of organisms。The more used organs will evolve to adapt more to the environment，and the unused organs will degenerate。

——The giraffe was not that long neck，and the need to eat the leaves had to stretch its neck longer，to stretch it longer and pass it on to future generations。Over time，it became the giraffe of today。Other examples have been used to confirm the conjecture that the waste retreat，such as blind fish grow in dark caves and do not need to see things，so the eyes degenerate and eventually lose function。Another example is that because domestic chickens are kept in captivity for a long time，they do not need to fly，so their wings degenerate，and so on。

In an era of creationism，the introduction of the rejection

hypothesis is remarkable，but it has been challenged since its inception。Darwin's Darwinian theory of\"natural selection\"holds that variation has nothing to do with an individual's will and is generated randomly generated，and environmentally friendly variation gives individuals more survival opportunities。