Water. (or saline).
red blood cells
Water
The gas which makes up the greatest percentage of earth's atmosphere is nitrogen with 78.08%.
Water
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Silica -IAmReallyRone
Blood makes up 7% of the weight of the body in humans. See: http://en.wikipedia.org/wiki/Blood
Nutrient? That would be fat. But if you mean substance, that would be water.
Erythrocytes make up about 45% of the blood Plasma makes up the other 55% and a Buffy coat consisting of leukocytes and platelets makes up less than 1%
plasma makes up 55% of your blood in your body
Blood
the percentage of a kids body is usually 70%