Fact 1: Phytoplankton are bacteria and algae that use sunlight to make food.

Fact 2: Since fish feed on phytoplankton, they are drawn to phytoplankton-rich waters.

Given the two facts above, answer the question "what do fish feed on?" with the following options: 
- rocks
 - embryos
 - pizza
 - algae
 - energy
 - insects
 - gills
 - food


 

    algae     