Sexual reproduction
a. increased genetic variation.
b. maintain a slow rate of evolutionary change.
c. maintained the same gene combinations over time.
d. limited the material in which natural selection can act upon.

The answer is A. the rest of the options are what happens as a result of asexual reproduction

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Many archeologists and anthropologists disagree with dr. thorne's view.  thorne strongly believes that what many calls "homo erectus"  was in fact  homo sapiens,  and that they migrated out of africa almost 2 million years ago and dispersed throughout europe and asia. that's way different  from what scientists have always believed about the evolution of the species.