Nmen, anabolic steroids cause select one: a. an increase in facial hair. b. the testes to increase in size. c. an increase in sperm production. d. a shutdown of normal testosterone production

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation:

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