The Darwin's theory of evolution

I’m interested in the evolution of life. I have attended the lecture about the Darwin’s theory of evolution since the beginning of second semester and I got the basic knowledge. So I will introduce it.

The first thing is just the Darwin’s theory of evolution. It is said the theory of natural selection. It can be explained by the example of giraffes. How did the neck of giraffes get longer and longer? The long neck is good to get and eat leaves on high trees. The theory shows that only the giraffes that have relatively long neck survived and the characteristic genes were passed from generation to generation. In short, the giraffes that can eat the leaves on the high tree have a greater probability of survival than that can not. As a result, the number of the children of the former gets larger and larger on the whole.

Another theory is the Lamarck’s theory of evolution. It is said the theory of use and disuse. This theory says that, in a giraffes’ lifetime, the harder they tried to crane their neck, the longer their neck got, and the acquired genes were passed from generation to generation. In other words, by trying to adapt to the environment, the organs of their body that are frequently used improved and the new genes were passed to the next.

The crucial difference between the two theories is where the characteristic genes come from. The potential genes they keep naturally are passed in the theory of natural selection. On the other hand, the genes they catch during their life are passed in the theory of use and disuse. In fact it got clear that the former theory is correct by after studies. In conclusion, the one who has naturally the body suitable for that environment can only survive and leave offspring. I studied this theme and felt it drastic and wonderful.