Which of these is an abiotic factor of an aquarium ecosystem?

a. algae growing on glass
b. gravel on the bottom of the aquarium
c. plants growing from the gravel
d. fish swimming in the water

The answer is b because abiotic means living and on only b was something to deal with nonliving

The following that is an abiotic factor of an aquariium ecosystem is the gravel at the bottom of the aquarium. This is because abiotic means non-living, and gravel is not alive.

B. Gravel on the bottom of the aquarium

Credit to: Pandaaas

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cramming before a final is bad because it makes a student's stress level higher. students who embrace cramming to get through a final exam week find themselves struggling to perform consistently, once the brain adjusts to prolonged sleep deprivation.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."