How does the movement of air molecules cause pressure?

How many bones are there in the human body?

What is the difference in the cell cycle between healthy cells and cancerous cells?

Paleontologists have found plant fossils deep within the layers of the north polar region. these leaf fossils have been labeled as to the rock layers they were found in, with the lower numbers being layers close to the earth's surface and higher numbers representing deeper layers. according to the numbers of these four leaf fossils, what might you infer?