6 Which of the following contributes to genetic variability within a population?
1. genetic drift
II. gene flow
III. mutations
IV. non-random mating
OA. I, II, and Ill only
OB. I, II, III, and IV
OC. I and II only
OD. III and IV only

(6.02 mc)what affect do marine protected areas have on environmental quality? they increase environmental quality by preventing resource overuse. they increase environmental quality by adding new species. they decrease environmental quality by removing all human activity. they decrease environmental quality by adding recycling facilities.