Science - 6th grade

A biologist studying a desert ecosystem observes that the population of a lizard species increases following a particularly hot, dry period that causes a snake population to decline. What could the biologist hypothesize 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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asked by Elina
  1. The snake seems to be in charge of controlling the lizard populations, a function fulfilled by a keystone species.

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    posted by Damon
  2. Ok, thank you

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    posted by Elina

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