Plants have cells, tissues, organs, and systems that allow them to function as complete organisms. Which parts of a plant function as an organ?
A. leaves
B. spores
C. root hairs
D. chlorophyll molecules
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What is one way the respiratory system and the circulatory system work together in the human body?
A. The circulatory system takes in nutrients, while the respiratory system delivers oxygen.
B. The circulatory system takes in water, and the respiratory system takes in carbon dioxide.
C. The respiratory system takes in nutrients, while the circulatory system delivers carbon dioxide to the cells of the body.
D. The respiratory system takes in oxygen, and the circulatory system delivers the oxygen to the cells of the body.
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