question_answer

Which of the following statements is/ are correct?

(i) Variations are actually differences among individual organisms or groups of organisms caused either by genetic differences or by environmental factors.

(ii) The sources of variations are mutation and genetic recombination.

(iii) Variation always brings survival advantage.

(iv) Speciation takes place when geographically isolated populations have variations.

(v) Darwin's theory of natural selection proposed that new species arise by slow accumulation of advantageous variations over a period of time.

A) Only (i)

B) (i) and (ii)

C) (i), (ii), (iv) and (v)

D) All (i), (ii), (iii), (iv), (v)

E) None of these