Energy is ultimately sourced by the sun.
Autotrophs are also known as producers in a food chain or energy pyramid. They use the sun’s energy to create food energy with the process of photosynthesis.
Heterotrophs are also known as consumers in a food chain or energy pyramid. They obtain nutrients by consuming others.
- Herbivores eat producers.
- Carnivores eat animals.
- Scavengers eat dead things.
- Omnivores eat both producers and animals.
- Decomposers break down dead things.
10% of the energy from one level transfers to the next level, and the other 90% is used to power life and burned off as heat.
Biology EOC Review 