posted by Steve .
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