I believe Oxygen would be the answer. Which Would Be Choice #2.
Answer from: Quest
answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.
explanation:
Answer from: Quest
1. efficient use of space
2. elimination of groundwater contamination
3. energy generation
4. lower carbon footprint
Another question on Biology
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How is the carbon cycle related to global warming ?