The statement can be completed with the following terms in the correct order:
- photosynthesis
- cellular respiration
- heat
So the filled statement would read:
“Chemical energy input converted from the sun occurs via photosynthesis in plants or ingesting food in animals; this energy drives the flow of matter into and out of the cell. The chemical energy is inefficiently converted into usable energy by cellular respiration, because all the stored energy is not converted into ATP some of it is released into the ecosystem as heat.”