A mosquito feeding off of a human.

Barnacles living on a whale, neither harms or hurts the whale..

What is an omnivore?

Bacteria living at the roots of a tree: the tree gains nutrients, but the bacteria gain nothing from the tree.

Mistletoe lives on and feeds off of a tree. The tree is harmed.

A lizards catches and eats an insect.

Lichen is a protist and an algae living together. The algae retains moisture that both need to live. The protist produces nutrients for both.

Both organisms benefit from living together.

Create their own energy source, autotrophs.

Amount of energy passed on from one trophic level to the next..

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