The bird population will increase.
The bird population will decrease.
The bird population will decrease, then increase.
The bird population will increase, then decrease.
The algae provide the corals with various nutrients.
The algae help the corals make a hard outside coating.
The algae allow the corals to live in deep ocean environments.
The algae release a toxin that keeps predators away from the corals.
They eat plants.
They eat animals.
They eat animals and plants.
They eat the food they make.
They break down nitrogen and oxygen.
They break down waste and dead matter.
They provide nutrients for carnivores to make energy.
They provide nutrients for omnivores to make energy.