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 an___.

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

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 an___.
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 an___.