Why do they call water h20

Embryos of different species look very similar, which shows that the organisms share a ancestor.

Which position represents spring in the southern hemisphere? a) b) c) d)

The size (radius) of an oxygen molecule is about 2.0 ×10−10m. make a rough estimate of the pressure at which the finite volume of the molecules should cause noticeable deviations from ideal-gas behavior at ordinary temperatures (t= 300k ). assume that deviatons would be noticeable when volume of the gas per molecule equals the volume of the molecule itself.