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Question 1: Which organ connects the mouth to the stomach? C) Esophagus Question 2: Which body part contains the smallest bones? A) Ear Question 3: What is the function of red blood cells? B) Carry oxygen Question 4: Where are rods and cones found in the body? A) Eyes Question 5: What helps joints move smoothly? B) Synovial fluid Question 6: Which hormone controls the sleep cycle? C) Melatonin Question 7: What makes blood red? Comment the answer