The diagram shows three layers of rock exposed on the side of a hill. The fossil evidence supports which hypothesis about the extinction of
the older reptile species?

when it is at an intermediate population density

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.