Matter is made of ____________.

__________ are tiny bits of matter that are too small to be seen.

Animals get their food molecules from the body matter of __________.

Animals use some food molecules to release __________ for movement and growth.

Organisms eat a variety of things.

A __________ is a diagram that ecologists make to show what eats what in an ecosystem.

Food molecules in an ecosystem can always be traced back to plants.

Animals __________ by changing food molecules into body molecules that can build their bodies.

An __________ is a scientist who studies ecosystems.