Some organisms are capable of asexual or sexual reproduction. Under favourable conditions, reproduction proceeds asexually. When conditions become more stressful reproduction switches to a sexual mode. Why?

• A

  Sexual reproduction is simple and more rapid allowing larger numbers of offspring to be produced.

• B

  Sexual reproduction requires two separate individuals, who can mutually provide nutrient support during stress.

• C

  Sexual reproduction produces individuals with new combinations of recombined chromosomes increasing diversity.

• D

  Asexual reproduction requires more energy.