Question

Which condition is a biotic factor of an aquarium ecosystem?

algae growing on the glass


amount of oxygen in the water


temperature of the water


gravel on the bottom of the aquarium

Answer 1

algae growing on the glass

Step-by-step explanation:

algae is living so it would be considered a biotic factor.

Answer 2

algae growing on the glass.

biotic means living thing and as such, oxygen, temperature, and gravel are not.