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Abiologist studying a desert ecosystem observes that the population of a lizard species increases following particularly hot, dry period that causes a snake population to decline. what could the biologist hypthesize about 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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