You are presented with the question "what do fish feed on?" and the following answer choices: 
- rocks
 - embryos
 - pizza
 - algae
 - energy
 - insects
 - gills
 - food

Now knowing that phytoplankton are bacteria and algae that use sunlight to make food and since fish feed on phytoplankton, they are drawn to phytoplankton-rich waters, choose the best answer.


 

    algae     