Answer:
Cellular respiration
Step-by-step explanation:
Conversion of solar energy and photosynthesis require specialized equipment that animal cells just don't have. Because animal cells don't have chloroplasts, those two options are out of the question.
Animals also do not create glucose. They break down glucose and O2 into energy, H2O and CO2. Plants, on the other hand, use energy, H2O, and CO2 to create glucose and O2.
Cellular respiration is the process by which cells break down "food" into useable energy. As you can see, this happens in both plant and animal cells!