All living things need energy to perform their life processes. How and where do they get the energy that they need?

Question

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

The correct answer is:

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

Living organisms obtain energy primarily through cellular respiration, which involves breaking down food molecules (such as glucose) to produce ATP (adenosine triphosphate), the energy currency of cells. While photosynthesis (option A) is essential for plants to convert light energy into chemical energy, it is not the primary means of energy acquisition for all living things. Options C and D are not relevant to how organisms obtain energy for life processes.