The correct option is A True
True. Aquarium is a miniature pond. It has sand with some water plants fixed in it. A few fishes swim in its water. There may be a couple of snails too. The electric bulb provides the light energy for the plants to produce food. The carbon dioxide given out by the fishes is used by the green plants to produce food. The oxygen given out by the plants during this process is used by the fishes, snails, etc.