Different species of birds build nests in the same type of trees. This is an example of __.

'Athlete's foot' fungus causes your toes to itch and burn. This is an example of ____.

A hawk sits on a telephone line watching for mice. This is an example of ____.

A squirrel lives in an oak tree. The squirrel is provided food and shelter while the tree is not harmed. This is an example of ___.

Sea anemones ride on the shells of hermit crabs. The anemones fend off octopuses, which eat crabs. The crabs drive away starfish and other anemone predators.

The tapeworm lives in the intestines of the dog, obtaining nutrients that normally would have been used by the dog.

If there is a drought which kills most of the producers in an ecosystem, which of the following is true?

There are less numbers of organisms on each level as you move up an energy pyramid because___.

Why are decomposers important to the consumers in an ecosystem?

In a food web, the arrows represent ____.

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