Question

How can an aquarium be made into a self-sustaining unit like a natural ecosystem?

• A. By adding some chemicals into the water
• B. By placing oxygen gas container in the aquarium.
• C. By adding more plants and animals
• D. By adding more fish

Answer 1

The correct option is C

By adding more plants and animals

An aquarium can be made self-sustained by adding more plants and animals in it which would help in recycling of certain substance like carbon dioxide, wastes etc which would otherwise pollute the environment of the aquarium.