The woolly mammoths have been extinct for a long time. Extinct means no longer existing on earth. The species has died out and is gone forever. The bones and teeth of extinct animals have been found. Scientists have found the woolly mammoths in Siberia. Ice preserved them for 25,000 years. Extinct insects have also have been found trapped in hardened tree sap. Fossils show how organisms from the past are different from organisms on Earth today. They also show that today's organisms evolved from these older species
