Which two organ systems provide materials required for the human body to produce ATP?

Correct Answer: B

Rationale: The digestive system provides glucose (from food), and the respiratory system provides oxygen, both needed for ATP production via cellular respiration. Other systems (A, C, D) don't supply these directly.

Correct Answer: A

Rationale: Villi increase surface area for nutrient absorption in the small intestine, making A correct; cilia and E. coli are not involved in this process.

Correct Answer: C

Rationale: Assuming X is stomach and Y is duodenum, the pyloric sphincter separates them, making C correct.

Correct Answer: B

Rationale: Gastric glands in the stomach secrete HCl, making B correct.

Correct Answer: C

Rationale: The epiglottis covers the trachea during swallowing, making C correct.