March 28, 2017

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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?
The lizard preys on the snake.
The lizard is a parasite of the snake.
The snake and lizard use the same limiting resource.
· The snake is a keystone species in the ecosystem.

my answer is D

  • Science - ,

    I think the snake may be a keystone species. If the snakes do not eat enough lizards the lizard population grows out of control.

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