List three main factors responsible for the speciation and briefly describe each one of them
The process by which new species develop from the existing species is known as speciation. The important factors which could lead to speciation are:-
i. Geographical isolation of a population caused by various type of barriers such as mountain ranges, rivers and seas.
ii. Genetic drift caused by drastic changes in the frequencies of particular genes by chance alone.
iii. Variations caused in individuals due to natural selection.