Answer
Autotrophs make their own source of energy whereas heterotrophs must consume other organisms for their energy needs.
Work Step by Step
Plants, some protists, and some bacteria are autotrophs because they can make their own source of energy (glucose) by harnessing the energy from the sun or from chemicals. Heterotrophs, on the other hand, must rely on consuming autotrophs, other heterotrophs, or dead organisms to obtain their source of energy.
