Write a note on "struggle for existence

1.	Write a note on "struggle for existence
Answer» Darwin has already shown his reader the power of artificial selection and the exquisite variation that exists in nature. In Chapter III he asks how varieties can become full species. Crucial to this is what he calls "the struggle for existence". That may be a conflict for food or a battle against the elements. Part of the evidence for this struggle is the immense potential that animal and plant populations have to increase in size. Even the elephant, one of the slowest breeders in the animal kingdom, could take over the planet if it were allowed to reproduce unhindered for long enough. After 500 years, one pair would leave 15 million descendants, Darwin tells us. Populations are kept in check because there are not enough resources to go around, and that leads to intense competition for survival.

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