You are presented with the question "What do phytoplankton and algae need in order to make energy?" and the following answer choices: 
- water
 - glucose
 - food
 - sunlight
 - bacteria
 - Light
 - adding heat
 - The Sun

Now knowing that phytoplankton are bacteria and algae that use sunlight to make food and food gives energy, choose the best answer.


 

    sunlight     