Plankton are tiny organisms that live in the water. They can be either phytoplankton (plants) or zooplankton (animals).

Here's what they eat:

* Phytoplankton are like tiny plants. They use sunlight to make their own food through photosynthesis. They don't eat anything.

* Zooplankton are like tiny animals. They eat other tiny organisms, including:

* Phytoplankton: Many zooplankton are herbivores and feed directly on phytoplankton.

* Other zooplankton: Some zooplankton are carnivores and feed on smaller zooplankton.

* Bacteria: Some zooplankton feed on bacteria.

So, while phytoplankton don't eat anything, zooplankton eat a variety of tiny organisms, including phytoplankton, other zooplankton, and bacteria.