Question

Both photosynthesis and cellular respiration are part of the carbon cycle. Which statement best compares these two processes?

Both release carbon dioxide as waste.
Both provide organisms with usable energy.
Both add bacteria to the soil.
Both require fixation in order to convert molecules.

Answer 1

Both provide organisms with usable energy.

Photosynthesis captures light energy and stores it in organic molecules (like glucose), while cellular respiration breaks down those molecules to release energy in a usable form (ATP).