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What factors interact to produce smog? a. sunlight and pollutants from fossil fuels b. particulates and pollutants from fossil fuels c. sunlight and oxygen d. sunlight and acid rain Which of these practices has contributed to the depletion of fish populations worldwide?. a. fishing bans b. catching reproduction-age fish c. rotating catches d. harvest reduction Question 4 A predator might control an introduced species by a. keeping the population from increasing. b. causing habitat fragmentation. c. increasing available niches. d. reducing biodiversity in the area. Question 5 Which level of the food chain is most affected by biomagnification? a. secondary consumers b. producers c. tertiary consumers d. primary consumers