I think the answer is skin. Skin contains sweat glands which secrete a fluid waste called sweat or perspiration; nonetheless, its primary functions are temperature control and release of pheromone. Its role as a part of the excretory is therefore minimal. Additionally, sweating also maintains the levels of salt in the body.
Stars and planets, i guess.
The answer is A because I’m in advanced classsss!!!
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It is useful and the cylinder graduated for us