An organism that cannot make its own food is called a heterotroph.

Here's a breakdown:

* Heterotrophs obtain their energy by consuming other organisms, either living or dead. This includes animals, fungi, and many bacteria.

* Autotrophs, on the other hand, can produce their own food through processes like photosynthesis (using sunlight) or chemosynthesis (using chemical energy). Plants are a prime example of autotrophs.

Let me know if you have any other questions about organisms!