Here are the answers to your questions:
Question 4: When an animal eats food, its digestion system breaks starches down into glucose molecules.
Question 5: What system of an animal's body delivers oxygen and glucose to all the different cells? circulatory
Question 6: Glucose begins the process of breaking down into smaller molecules in the cytoplasm of the cell. Next, these smaller molecules move into the mitochondria (known as the powerhouses of the cell).