Q.

Which is the organ that excretes water, fat and various catabolic wastes :

A. Kidney
B. Skin
C. Spleen
D. Salivary glands
Answer» A. Kidney
Explanation: The kidneys are organs that serve several essential regulatory roles in most animals, including vertebrates and some invertebrates. They are essential in the urinary system and also serve homeostatic functions such as the regulation of electrolytes, maintenance of acid-base balance, and regulation of blood pressure (via maintaining salt and water balance).
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