Q: Loss of energy is the reason that what typically has few levels?


Read this paragraph and choose the correct option from the provided answers:

At each level of a food chain, a lot of energy is lost. Only about ten percent of the energy passes to the next level. Where does that energy go? Some energy is given off as heat. Some energy goes into animal wastes. Energy also goes into growing things that another consumer can't eat, like fur. It's because so much energy is lost that most food chains have just a few levels. There’s not enough energy left for higher levels.

 Choices:

- humans

- the atmosphere

- video games

- food chain


A:
food chain