sentence: Evolution mainly works by natural selection.
sentences_after: Animals and plants which are best suited to their environment will, on average, survive better. There is a struggle for existence. Those who survive will produce the next generation. Their genes will be passed on, and the genes of those who did not reproduce will not. This is the basic mechanism which changes a population and causes evolution.
concept_name: evolution
headings: Evolution Darwin's theory Natural selection
categories: History of science