How is it possible that we have knowledge in the human sciences that we are not aware of?

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:

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.

answer; cnidarians;