Among vertebrate animals, urea
A) is made in the kidneys and immediately excreted.
B) is exhaled, along with carbon dioxide, by the lungs.
C) is made in the liver by combining two ammonia molecules with one carbon dioxide.
D) is made in the pancreas and added to the intestinal contents, along with bile salts, for excretion.
E) is rarely excreted as a waste product.
Correct Answer:
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