Which condition is a biotic factor of an aquarium ecosystem?
o amount of oxygen in the water
temperature of the water
o
algae growing on the glass
o
gravel on the bottom of the aquarium

Algae growing on the glass

Explanation:

biotic means it's alive, while abiotic means it's not alive

The answer is the algae one!

Explanation:

I took the K-12 test and got 100%!

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it