On the video of the theory of natural selection the teacher talks about Darwin and his theory.

Darwing started thinking about two circustances, the favour variations who want to be preserved, and the unfavour variations who want to be destroyed, this led to the theory of natural selection. Firstly, he wrotte but didn´t publish his theory of natural selection.

Also Darwin though about artificial selection, there are a lot of examples about it, for example horses, cows, fishes… By artificial selection we can have cabbages, couliflower, rapeseed, turnips or brocoli from a white mustard plant.

Now we are going to see the important years of the theory of Darwin:

1844- Darwin started to study a lot of biology from books, specially he studied burnacles, he spent 8 years studing burnacles. He wanted to study them bebore publising his theory of natural selection.

1856- He wanted to make sure his theory, so nobody could argue with him. So he started thinking in overpopulation. Finally Darwin was convinced by his friends to give out his theory.

1858- Darwin appeared before The Linnaean society and propose the theory of natural selection.

1859- The controversial book called Origin of species was published.

1871- In this year Darwin publish another book, more controversial than the last one, called The origin of man.

Darwin said one of the most simplest, elegant and important theories, that was the theory of natural selection, that consist on 5 points:

1) Overpopulation: more organisms are born than can posibly survive.

2) Variation.

3) Competition: organisms would compete for everything.

4) Fittest will survive.

5) Reproduction.

Finally the teacher say that all of this traits will be passed to the next generation.