Fact 1: Zooplankton are tiny animals that feed on phytoplankton.

Fact 2: Planktonic plants are called phytoplankton.

Given the two facts above, answer the question "what do zooplankton feed on?" with the following options: 
- planktonic plants
 - Chemical energy
 - animals
 - microorganisms
 - NaCl
 - Chlorophyll
 - insects
 - an area swollen with pus


 

 planktonic plants        