I learned this long ago, I think it's either Mitosis or cell division, this is when one cell divides to make 2 cells and those 2 cell divide to make 4 cells and those 4 cells divide to make 8 cells and so on.
Answer: a hard sedimentary rock, composed mainly of calcium carbonate or dolomite, used as building material and in the making of cement.
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Water through a cell membrane.
