Question

All living things need energy to perform their life processes. How and where do they get the energy that they need?
A.
the production of carbon dioxide through the process of photosynthesis
B.
the fixation of nitrogen gas from the atmosphere
C.
the oxidation of food through the process of cellular respiration
D.
the absorption of light that radiates from the Moon

Answer 1

C. the oxidation of food through the process of cellular respiration

Explanation: Cells release energy by oxidizing organic molecules (e.g., glucose) during cellular respiration, producing ATP to power life processes. Photosynthesis makes food for autotrophs, nitrogen fixation supplies usable nitrogen, and moonlight does not provide significant usable energy.