question_answer 47)

  According to the evolutionary theory, formation of a new species is generally due to (a) sudden creation by nature (b) accumulation of variations over several generations (c) clones formed during asexual reproduction (d) movement of individuals from one habitat to another

Answer:

                  (b)Accumulation of variations over several generations forms new species. Genetic drift accumulate different changes in sub-populations of a species. Also, natural selection may also operate differently in the different geographic locations. Eventually, different groups of new species will be formed.