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 at the top 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 bottom of the pyramid.

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

A) Mutualism
B) Parasitism
C) Commensalism

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

A) Harmed
B) Helped

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) 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 should probably die on its own.
C) Because the parasite depends on its host for its needs.

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