Light, water, dissolved oxygen, plants and fishes are part of an aquarium as shown in the above picture. They are in perfect equilibrium. This is an example of ___.

Light, water, dissolved oxygen, plants and fishes are part of an aquar

1.	Light, water, dissolved oxygen, plants and fishes are part of an aquarium as shown in the above picture. They are in perfect equilibrium. This is an example of ___.
Answer» Light, water, dissolved oxygen, plants and fishes are part of an aquarium as shown in the above picture. They are in perfect equilibrium. This is an example of ___.