An organism that cannot create its own food and must eat other organisms as a source is called a heterotroph.

Here's a breakdown:

* Hetero means "other"

* Troph means "nourishment"

So, a heterotroph literally means "other nourishment".

Examples of heterotrophs include:

* Animals

* Fungi

* Most bacteria

These organisms obtain their energy and nutrients by consuming other organisms, either dead (decomposers) or alive (predators, parasites, herbivores).