Fact 1: An aquatic animal requires great amounts of water to survive.

Fact 2: Too much algae can deplete the water of oxygen, making it impossible for aquatic animals to survive.

Given the two facts above, answer the question "an aquatic animal requires not having too much what in water?" with the following options: 
- warmth
 - Energy.
 - energy
 - fats
 - algae
 - matter
 - harm
 - sodium


 

     algae    