Question

All living things need energy to perform their life processes. How and where do they get the energy that they need?
A.
the fixation of nitrogen gas from the atmosphere
B.
the production of carbon dioxide through the process of photosynthesis
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.

Organisms release energy by oxidizing organic molecules (e.g., glucose) in cellular respiration to make ATP. (Photosynthesis makes food using sunlight and releases O2, nitrogen fixation supplies building blocks, and moonlight is not a primary energy source.)