Who proposed the theory of Natural Selection? Mention the two principles of this theory.

Charles Darwin proposed the theory of natural selection in 1859. He defined natural selection as "the populations which are a better fit in an environment will be selected by nature and will survive more."

Natural selection based on—

i. Population size

ii. Variation inherited

iii. Limited natural resources

The two principles of this theory are—

i. Survival of the fittest

ii. Struggle for existence