Phytoplankton are bacteria and algae that use sunlight to make food, and sunlight beams down on the different types of algae. Given these facts, phytoplankton  use what to make food among the following options:
- sun's heat
 - sunlight beams
 - refraction of light
 - heat energy
 - visible energy
 - by indirect light
 - produce light
 - Positive charges


 

  sunlight beams       