Kidneys, lungs, gills, and sweat glands, are parts of which one system in animals?
A
Digestive
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B
Excretory
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C
Circulatory
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D
Nervous
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Solution
The correct option is B Excretory One of the major organs of the excretory system is the kidneys. The kidneys are complex organs that play an important role in the production, storage, and release of liquid waste. Gills in fish are part of their excretory system which excretes ammonia. The lungs in the respiratory system excrete some waste products, such as carbon dioxide and water. The skin is another excretory organ that removes the body's wastes through the sweat glands.