By which process does the carbon return to the atmosphere as CO2?
(a) Decayed organisms
(b) Calcareous sediments
This question was addressed to me in unit test.
My doubt is from Ecosystem in section Ecosystem of Biology – Class 12
The correct answer is (d) Respiration
Best explanation: The respiration is the process in which the organisms exchange gases with the environment. In this, the organisms take in the atmospheric oxygen for various cellular activities and release carbon dioxide. Thus the carbon returns to the atmosphere as CO2 with the help of respiration.