You are presented with the question "Fish and other animals eat tiny animals that feed on what?" and the following answer choices: 
- heat energy
 - light energy
 - Organic compounds
 - Energy.
 - phytoplankton
 - Chemical energy
 - an organism's body
 - kinetic energy

Now knowing that zooplankton are tiny animals that feed on phytoplankton and fish and other animals eat the zooplankton, choose the best answer.


 

     phytoplankton    