Question

1) As a result of sexual reproduction, the rate of evolutionary change in the plant and animal kingdoms has been greatly increased because2)Which process is primarily responsible for maintaining variation in a population

Answer 1

The answer of the first question is: "The offspring show more diversity than in asexual reprodution".

but, why this implies a higher rate of evolutionary change? because it facilitates that the variation that appeared in one lineage by a random mutation to mix with that of another lineage, which accelerates the evolutionary procces.