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 absorption of light that radiates from the moon
c. the production of carbon dioxide through the process of photosynthesis
d. the oxidation of food through the process of cellular respiration

Explanation:

• Option A: Nitrogen fixation is about converting atmospheric nitrogen, not energy acquisition for living things.
• Option B: The Moon doesn't radiate light (it reflects the Sun's light), and living things don't get energy from Moon - radiated light for life processes.
• Option C: Photosynthesis is how autotrophs (like plants) produce food (glucose) using light energy, but it's the production of energy - storing molecules, not the direct use of energy for life processes.
• Option D: Cellular respiration is the process by which living cells break down (oxidize) food (like glucose) to release energy in the form of ATP, which is used for all life processes. All living things (both autotrophs and heterotrophs) perform cellular respiration to get the energy they need.

Answer:

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