Here are the answers to your questions:
Question 1: When an animal eats food, its digestion system breaks starches down into ___________ molecules.
Answer: glucose
Question 2: What system of an animal's body delivers oxygen and glucose to all the different cells?
Answer: circulatory
Question 3: Glucose begins the process of breaking down into smaller molecules in the cytoplasm of the cell. Next, these smaller molecules move into the ________ (known as the powerhouses of the cell).
Answer: mitochondria
Question 4: Energy in the form of ATP is released during cellular respiration. What are the two waste products of cellular respiration?
Answer: Carbon dioxide and water