The ocean floor - A: is always a flat bed of sand
B: has mountains, plains, and ridges like land surfaces
C: is covered by the same amount of water everywhere
D: covers less area than the land

Why does sexual reproduction increase the genetic variation in a species? a. sexual reproduction doubles the chromosome number. b. sexual reproduction produces organisms with no dna. c. the gametes in sexual reproduction are exact clones of the parents. d. a fertilized egg has a mixture of alleles from the two parents.