Organisms that depend on the food energy stored in other living organisms are called heterotrophs.

Here's a breakdown:

* Autotrophs: These organisms, like plants and some bacteria, can produce their own food energy through processes like photosynthesis.

* Heterotrophs: These organisms cannot produce their own food and must obtain it from other living things. They consume other organisms for their energy needs.

Here are some examples of heterotrophs:

* Animals: All animals are heterotrophs. They eat plants, other animals, or both.

* Fungi: Fungi obtain their food by absorbing nutrients from dead organic matter.

* Many bacteria: Some bacteria are decomposers, breaking down dead organisms for energy. Others are parasites, living off of other living organisms.

Let me know if you want to delve deeper into any specific type of heterotroph!