Urine formation is involved in water and electrolyte balance in vertebrates.Which of the following statements is the most correct regarding urine formation?
A) Reabsorption is highly selective so that only ions that are needed are reabsorbed.
B) The Malpighian tubules form the pre-urine.
C) Water is actively pumped across cell membranes to create osmotic gradients.
D) The formation of the pre-urine is selective.
Correct Answer:
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