The atmosphere contains a relatively low concentration of carbon, mostly in the form of CO₂.Why is this small amount considered important in the carbon cycle? A) Although small, it is the largest pool of carbon on Earth. B) It is the only source of carbon capable of moving from one pool to another. C) It remains in the atmosphere for long periods of time. D) Its concentration in the atmosphere is currently decreasing. E) It is the source of carbon for living organisms that carry out photosynthesis.

Question

Quizplus · Accepted Answer

Although the concentration of carbon in the atmosphere is relatively low, it is still an important source of carbon for living organisms that carry out photosynthesis. The carbon in the atmosphere is transformed into organic compounds through photosynthesis, which is the primary way that carbon enters the food chain. Therefore, even though the amount of carbon in the atmosphere is small, it plays a crucial role in the carbon cycle.

The Atmosphere Contains a Relatively Low Concentration of Carbon, Mostly