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2.A biologist studying a desert ecosystem observes that the population of a lizard species increases following a particulary hot, dry period that causes a snake population to decline what could the biologist hypothesize bout the roles of these two species?
A.the lizard preys on the snake.
B.the lizard is a parasite of the snake.
C.the snake and lizard use the same limiting resource
D.the snake is a keystone species in the ecosystem**?

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