The pyloric sphincter is compose of smooth muscle and is located between the pylorus in the stomach and duodenum of the small intestine. In digestion, it serves as a valve controlling the flow of food thus it prevents the contents of small intestine backing up into the stomach.
Answer:
1. sunlight reflects to us from its surface
2. moons cycle
Your answer will probably be A compound microscope speaking how compounds are pretty small.
Answer: pulmonary artery carries deoxygenated blood away from the heart