Write a short note on the theory of Natural selection"

Explanation

1. Natural selection states that nature only selects or decides which organism should survive or perish in nature.
2. the organisms with useful traits will survive and the organisms having harmful traits are going to be perished or eliminated from its environment.
3. let us consider a group of red beetles which live in bushes on green leaves and gro by sexual reproduction.
4. Let us assume crows eat these red beetles.
5. Let us consider one colour variation arises during reproduction so that there is a beetle that is green in colour instead of red.
6. Moreeover this green coour beetle passes its colour to its offspring so that all its progeny are green.
7. Crows cannot see the green coloured beetles on green leaves of the bushes and therefore crows cannot eat them.
8. But crows can see the red cbeetles and eat them
9. As result, there are more and more green beetle than red ones which decrease their number.
10. The variation of colur of beetle green gave a survival advantage to green beetles than red beetles.
11. In other words, it was naturally selected by means of crows.
12. The more crows there are, the more red beetles would be eaten and the more number of green beetles in the population would be. thus the natural selection is directing evolution in the beetle population.