Question

What do you mean by evolution and what factors are involved in it

Answer 1

Evolution. In biology,evolution is the change in the inherited traits of a population from generation to generation. These traits are the expression of genes that are copied and passed on to offspring during reproduction. ... In contrast, genetic drift produces random changes in the frequency of traits in a population.

Answer 2

If there is any sudden change happened just from a small group of population to a majority one, it is evolution. Its factors are mutation, climatic condition, work place, in search of food, etc.