Which of these provides the selection pressure maintaining sexual reproduction, according to the Red Queen hypothesis?
A. Sexual populations have only half the fitness of asexual populations.
B. Females are able to choose males with superior genes.
C. Pathogens of the sexual organism evolve to overcome the organism's defenses.
D. Strains with different beneficial mutations are able to come together during recombination.
E. Stabilizing selection maintains a 50:50 sex ratio.
Answer: C. Pathogens of the sexual organism evolve to overcome the organism's defenses.
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A shortened snout and a relatively flat face are associated with
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