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For an aquarium to become a self-sustaining system, what needs to be added?

Question
For an aquarium to become a self-sustaining system, what needs to be added?
Only water
Only oxygen
A few aquatic plants and animals
Only fish food
Answer
A few aquatic plants and animals
Detailed Explanation
Adding a few aquatic plants and animals to an aquarium can help it become a self-sustaining system. — Examisthan.com
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