A biologist studying a desert ecosystem of theirs at the population of a lizard species increases of following a particularly hot dry. That causes a snake population to decline what could the biologist hypothesis 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.