Final answer:
Aquarium C with warm salt water and fish would require the most air to maintain oxygenation due to the lower solubility of oxygen in warmer and saltier water, more than Aquarium A with just warm water and some fish, and Aquarium B with cold water, fish, and algae.
Step-by-step explanation:
When considering which aquarium requires the most air to maintain oxygenation of the water for fish survival, several factors need to be considered. Warmer water holds less dissolved oxygen than cold water, and salt water also holds less oxygen than fresh water. Therefore, an aquarium with warm water would need more air to maintain oxygenation than an aquarium with cold water. Furthermore, adding salt to water decreases its ability to hold oxygen. Additionally, while algae can produce oxygen during photosynthesis when light is available, oxygen is still consumed during respiration 24/7 by both algae and fish.
Considering the information provided, Aquarium C with warm salt water and some fish would require the most air bubbled in to maintain adequate oxygen levels because warm water and high salinity both contribute to lower oxygen solubility. Aquarium A with warm water and some fish also would have reduced oxygen solubility, but not as much as saltwater. Aquarium B, despite having algae which can produce oxygen, has cold water, which can hold more dissolved oxygen probably making it the one with the least need for additional oxygen through air bubbles, assuming there is sufficient light for photosynthesis.