A large grasshopper and a small mouse may be similar in size. However, the total length of blood vessels is much greater in the mouse, and the mouse's heart pumps at much higher pressure than the grasshopper's hearts. Which statement is most useful for explaining these observations? A. The mouse pumps blood through its circulatory system; the grasshopper pumps air and water. B. The mouse has a four-chambered heart; the grasshopper has a much simpler heart structure. C. The mouse is a mammal; the grasshopper is an insect. O D. The mouse has a closed circulatory system; the grasshopper has an open circulatory system.

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