1. What is the smallest unit of matter? Atom 2. Which gas do plants absorb from the atmosphere during photosynthesis? Carbon dioxide 3. What is the primary function of the nervous system? Communication 4. What is the chemical symbol for the element oxygen ) O 5. What is the Earth's largest organ? Skin 6. Which of the following is a greenhouse gas? Carbon dioxide 7. . Which of the following is NOT a macronutrient Vitamin C 8. Which part of the human brain is responsible for regulating basic bodily functions like breathing and heart rate? Medulla oblongata

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