Volcanic eruptions may occur in both locations, as the movement can cause the tectonic plates to allow magma through.
So abiotic means nonliving, so the only abiotic option is B. the gravel on the bottom of the aquarium.
Answer:
They need backups.
Explanation:
If the organism only has one food source they will use up that resource and eventually the organism will deplete due to lack of food.
An organism that eats decomposed items. For example plant detritus.
