Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?
1. Volcanic action
2.

Question

Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?
1. Volcanic action
2. Respiration
3. Photosynthesis
4. Decay of organic matter
Select the correct answer using the code given below:

Accepted Answer

Volcanic activity releases gases, including carbon dioxide, from the Earth's interior into the atmosphere. Respiration by living organisms, including animals and microbes, breaks down organic compounds and releases carbon dioxide. The decomposition of dead organic matter by microorganisms also releases carbon dioxide back into the environment. Photosynthesis, conversely, removes carbon dioxide from the atmosphere.