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Filtration, Reabsorption, Secretion: The Three Steps of Urine Formation. The kidneys filter unwanted substances from the blood and produce urine to excrete them. There are three main steps of urine formation: glomerular filtration, reabsorption, and secretion.
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the first one i think is d
Both require oxygen. hope this helped! have a good day:)
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genetic trait=eye color (a)
environmentally influenced trait=the language you speak (b).
To avoid any injuries or emergencies <span />