Yes, an organism that relies on other organisms for its food and energy supply is called a heterotroph.

Here's why:

* Hetero means "other" or "different"

* Troph refers to "nourishment" or "feeding"

So, a heterotroph literally means "other-feeder".

Examples of heterotrophs include:

* Animals

* Fungi

* Most bacteria

In contrast, autotrophs are organisms that can produce their own food through processes like photosynthesis (using sunlight) or chemosynthesis (using chemicals).