A) By making their own food from the sun.
B) By breaking down the remains of dead organisms.
C) By going to the grocery store and shopping for food.

A) The amount of energy is highest at the bottom of the pyramid.
B) The amount of energy is highest in the middle of the pyramid.
C) The amount of energy is highest at the top of the pyramid.

A) The struggle among organisms to survive in a habitat with limited resources.
B) A term scientists use that shows that organisms are getting along in an environment.
C) The way that animals mate with one another.

A) Parasitism
B) Mutualism
C) Commensalism

A) Fungus on a beetle bug.
B) Feathers on a bird fluffing up in the wind.
C) An apple growing from a tree.

A) Harmed
B) Helped

A) Rapidly
B) Never
C) Slowly

A) Zebras don't eat grass so the wildebeests can have it all
B) Zebras eat tall grass and wildebeests eat short grass
C) Wildebeests don't eat grass so the zebras can have it all

A) Rabbit is predator
B) Owl is predator

A) It wouldn't be a bad a idea for a parasite to kill its host.
B) Because the parasite depends on its host for its needs.
C) Because the parasite should probably die on its own.

A) Comparison
B) Competition
C) No one would touch them
D) Everyone getting along