EVERYDAY SCIENCE

Detailed explanation-1: -He suggested that such traits might evolve if they are sexually selected, that is if they increase the individual’s reproductive success, even at the expense of their survival (Darwin 1871). Darwin noted that sexual selection depends on the struggle between males to access females.

Detailed explanation-2: -More individuals are produced each generation that can survive. Phenotypic variation exists among individuals and the variation is heritable. Those individuals with heritable traits better suited to the environment will survive.

Detailed explanation-3: -English naturalist Charles Darwin developed the idea of natural selection after a five-year voyage to study plants, animals, and fossils in South America and on islands in the Pacific. In 1859, he brought the idea of natural selection to the attention of the world in his best-selling book, On the Origin of Species.