Answer:
We conclude that the correct answer is the A) Algae that grow in the crystal.
Explanation:
Hello!
Let's solve this!
A biotic factor is a factor that has life.
Let's analyze each of the options:
A) Algae that grow in the crystal: algae are living beings and grow in an aquatic ecosystem.
B) Gravel at the bottom of the aquarium: gravel is an abiotic factor, that is, lifeless.
C) Amount of oxygen in the water: it is an abiotic factor
D) Water temperature: it is not a biotic factor.
After the analysis, we conclude that the correct answer is the A) Algae that grow in the crystal.
