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 oxidation of food through the process of cellular respiration
C.
the fixation of nitrogen gas from the atmosphere
D.
the absorption of light that radiates from the Moon

Answer 1

B

All organisms obtain usable energy by oxidizing organic molecules (food) in cellular respiration — producing ATP. In eukaryotes this mainly occurs in mitochondria; in prokaryotes it occurs across the cytoplasm and membrane. Photosynthesis, nitrogen fixation, and moonlight are not the universal primary energy source for all life.