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

Fact 2: Sunlight beams down on the different types of algae.

Given the two facts above, answer the question "Phytoplankton  use what to make food?" with the following options: 
- sun's heat
 - sunlight beams
 - refraction of light
 - heat energy
 - visible energy
 - by indirect light
 - produce light
 - Positive charges


 

  sunlight beams       