This is one of the biogeochemical cycles; it has both a sedimentary and gaseous phase, enters biological cycles through photosynthesis, and is the largest contributor to acid rain and smog.

The answer is; Carbon Cycle

Carbon exists in the atmosphere as carbon dioxide. It is incorporated into the biosphere through photosynthesis where it is converted to carbohydrates. When carbon-based compounds are burned in air, carbon dioxide is produced and when it moves with precipitation, it causes acid rain (carbonic acid).

answer; hypnagogic sensations)

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: