An organism that gets its energy from other organisms is called a heterotroph.

Here's why:

* Hetero means "other" or "different"

* Troph means "nourishment" or "food"

So, heterotrophs literally get their nourishment from other organisms. They can't make their own food like plants do (which are called autotrophs).

Examples of heterotrophs include:

* Animals: They eat plants or other animals.

* Fungi: They absorb nutrients from decaying organic matter.

* Bacteria: Some bacteria are decomposers, while others are parasites that live off other organisms.