Old and new species
Fossils provide a record of organisms that lived a long time ago. They also provide evidence that animals and plants can change over long periods of time. The fossil record is often incomplete. However, there is a good fossil record for the evolution of the horse.
Fossils are the preserved remains or traces of dead organisms [organism: A living being - plant, animal, fungus or bacterium. ]. They are found in rocks.
Fossils can be formed from:
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