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Valves, they are like flaps of muscle that keeps the blood in its place util its ready to be pumped along.
I'm pretty sure it's Latin, acer means tree and I think rubrum is red
I think for your distilled water of 1 it would look like 27.8 +/- 5 because you can go 5 above or below your average and 2 would be 27.8 +/- 10 because you can go 2 times below or above your average?