Question

theory of natural selection

Answer 1

Natural selection refers to the phenomenon in which nature selects traits favourable to species for their survival in the ecosystem.

Answer 2

Answer:

THEORY OF NATURAL SELECTION –

➸ Within any population, there is natural selection.

➸ There are many variations in the individuals.

➸ Even though there is large population, population remains constant because of natural selection.

➸ There is a competition in the members of the same species for different resources.

➸ The fit ones survive and reproduce in this competition.

➸ The favourable variations of the individuals are passed on to the next generation.

➸ These variations accumulated over a long period of time leads in the origin of new species.

ORIGIN OF NEW SPECIES –

➸ Geographical isolation.

➸ Genetic drift.

➸ Variations

NATURAL SELECTION –

Natural selection is the process of evolution of a species where by characteristics which help individual organisms to survive and reproduce are passed on their offsprings, and those characteristics which are of no help are not passed.