Question

The cycling of carbon between organisms and their environment is MOST directly accomplished by which of the following pairs of processes?



a
condensation and phosphatization
b
respiration and photosynthesis
c
transpiration and carbonation
d
oxidation and precipitation

Answer 1

The cycling of carbon between organisms and their environment is MOST directly accomplished by the processes of **respiration and photosynthesis**.

- **Photosynthesis** allows plants and other autotrophs to convert carbon dioxide from the atmosphere into organic compounds, primarily glucose, using sunlight.
- **Respiration** is the process by which organisms, including plants and animals, convert those organic compounds back into carbon dioxide, releasing energy in the process.

Thus, the correct answer is:

**b. respiration and photosynthesis**.