Fossils provide solidevidence of evolution, and fossils show a progression of evolution. Scientists determine the age of fossils and categorize them from all over the world to determine when organisms lived relative to each other. The resulting fossil record tells the story of the past and shows theevolution经过数百万年的的形式。例如,scientists have recovered highly detailed records showing the evolution of humans and horses.

In the display on the left, fossil hominids are arranged from oldest (bottom) to newest (top). As hominids evolved, the shape of the skull changed. On the right is an artist’s rendition of an extinct species of the genus科仕. It reveals that these ancient species resembled the modern horse (科仕ferus) but varied in size.