Abiologist 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