You are presented with the question "Phytoplankton  use what to make food?" and the following answer choices: 
- sun's heat
 - sunlight beams
 - refraction of light
 - heat energy
 - visible energy
 - by indirect light
 - produce light
 - Positive charges

Now knowing that phytoplankton are bacteria and algae that use sunlight to make food and sunlight beams down on the different types of algae, choose the best answer.


 

  sunlight beams       