AP Biology Quiz
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ECOLOGY
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A biologist observes a population of frogs breeding in ponds. Pond A has 40 adult frogs; Pond B has 400 adult frogs. Both ponds have similar water chemistry and experience the same precipitation. Tadpole counts show that a smaller fraction of eggs in Pond B survive to metamorphosis, and the biologist records frequent tadpole-to-tadpole contact and more cloudy water in Pond B. A parasite that spreads through waterborne contact is detected more often in Pond B. Which explanation best accounts for the lower survival in Pond B?
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