The resulting fossil record tells the story of the past and shows the evolution of form over millions of years ( Figure).
Scientists determine the age of fossils and categorize them from all over the world to determine when the organisms lived relative to each other. Fossilsįossils provide solid evidence that organisms from the past are not the same as those found today, and fossils show a progression of evolution. Darwin dedicated a large portion of his book, On the Origin of Species, to identifying patterns in nature that were consistent with evolution, and since Darwin, our understanding has become clearer and broader. Looking at every level of organization in living systems, biologists see the signature of past and present evolution. The evidence for evolution is compelling and extensive.
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