Fossils provide evidence that 1) life on earth millions of years ago was more complex than life is today 2) the changes that will occur in species in the future are easy to predict 3)many species of organisms that lived long ago are now extinct 4)most species of organisms that lived long ago are exactly same today

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.