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the process whereby a particular change causes a response which reverses that change.
is the gradual increase in the average temperature of Earth's atmosphere and oceans.
a thin, flexible layer of the plant cell wall inside the middle lamella. It consists mainly of...
kidney failure which develops over a long period of time.
a microscopic hair-like extension of the cell membrane of the epithelial cells forming the outer...
the muscular tube of the mammalian digestive tract that links the mouth to the stomach.