Question

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

A.
algae growing on the glass

B.
gravel on the bottom of the aquarium

C.
plants growing from the gravel

D.
fish swimming in the water

Answer 1

The correct answer is B.gravel on the bottom of the aquarium

Answer 2

B: the gravel on the bottom of the aquarium, because it is not a living thing like the algae, plants and fish.
:)