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49. Why is a closed circulatory system more efficient than an open circulatory system?
(A) It eliminates the need for a heart to pump blood throughout the body.
(B) It uses less energy than an open circulatory system, making it more efficient.
(C) Blood freely bathes organs, increasing nutrient absorption and oxygen delivery.
(D) It only transports oxygen, not other nutrients or metabolic waste.
(E) Blood is contained within vessels, allowing for higher pressure and faster circulation.
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統計： A(0), B(2), C(0), D(2), E(5) #3429728
統計： A(0), B(2), C(0), D(2), E(5) #3429728
