You are presented with the question "what do zooplankton feed on?" and the following answer choices: 
- planktonic plants
 - Chemical energy
 - animals
 - microorganisms
 - NaCl
 - Chlorophyll
 - insects
 - an area swollen with pus

Now knowing that zooplankton are tiny animals that feed on phytoplankton and planktonic plants are called phytoplankton, choose the best answer.


 

 planktonic plants        