Question

Theory of Natural Selection dwells on

(a) role of environment in evolution

(b) natural selection acting on favourable variations

(c) changes in gene complex resulting in heritable variations

(d) none of the above.

Answer 1

Correct answer:- (b) natural selection acting on favourable variations

Explanation:- Theory of natural selection:- proposed by darwin.He defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

microevolution:-
Natural selection can change a species in small ways, causing a population to change colour or size over the course of several generations. This is called microevolution.
Macroevolution:-
enough time and enough accumulated changes, natural selection can create entirely new species, known as "macroevolution."
Natural selection is capable of both microevolution and macroevolution