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

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

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

A) Parasitism
B) Mutualism
C) Commensalism

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

A) Helped
B) Harmed

A) Slowly
B) Rapidly
C) Never

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

A) Owl is predator
B) Rabbit is predator

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

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