SAT Subject Biology Practice Question 60: Answer and Explanation

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Question: 60

4. Which of these describes an adaptation to an arid environment?

A. A short loop of Henle, which allows more filtrate to be removed from the blood
B. A short loop of Henle, which allows less water to be removed from the filtrate
C. A long loop of Henle, which allows more filtrate to be removed from the blood
D. A long loop of Henle, which allows more water to be removed from the filtrate
E. A long loop of Henle, which allows less filtrate to be removed from the blood

Correct Answer: D

Explanation:

A long loop of Henle allows more water to be removed from the filtrate before it is excreted as urine. This causes the urine to be even more hyperosmotic and conserves water.

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