Final answer:
Animals and other organisms that cannot perform photosynthesis obtain energy through the process of Cellular respiration, which converts glucose and oxygen into energy in the form of ATP.
Step-by-step explanation:
The process that animals and other organisms that are unable to do photosynthesis undergo to obtain energy is c) Cellular respiration. Cellular respiration is a biological process by which cells convert glucose and oxygen into water, carbon dioxide, and energy in the form of ATP (adenosine triphosphate). This process involves several steps, including glycolysis, the citric acid cycle, and electron transport chain and chemiosmosis. It is important to note that oxygen is essential for cellular respiration, making it an aerobic process. As a result, this efficient energy-generating pathway enables heterotrophs, organisms that cannot produce their own food, to release and utilize energy stored in carbohydrates.