Explain the Darwin's theory of Natural selection with an example. What do you understand by the term natural selection ? Write drwin's theory of evolution.

Explanation

1. Darwin proposed the theory of Natural selection' means 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 group of beetles that live in bushes on green leaves Their population will grow by sexual reproductio. So they generate variations in their population.
5. Let us assume crows eat these red beetles, if the crows eat more red beetles, their population slowly reduces.
6. Let us consider on ecolour variation arises during reproduction so that there is a beetle that is green in colour instead of red.
7. Moreover this green colour beetle passes its coulur to its offspring, so that all its progeny are green.
8. crows cannot see the green coloured beetles on green leaves of the bushes and therefore crows cannot eat them.
But crows can see the red beetles and eat them, as a result there are more and more green beetles than red ones which decrease in their number
10 The variation of colur of beetle green gave a surviva adcantage to green beetles than red beetles. In other words it was naturally selected.