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

A) algae growing on the glass

Explanation:

Biotic translates to Living,

here out of all 4 options algae is the ONLY living Factor. Hence, the right answer is option A

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it's anything that aren't producers and consumers.

explanation:

you've got to be clear on what "this" is

answer; polycythemia is the correct answer;