Fossils are preserved, or lasting remains of once-living organisms, such as bones, teeth, shells, and imprints. An organism can be an animal, a plant, an insect or a single-celled form of life. Fossils can be very old. New fossils have recently been discovered on an island called Greenland, that are in rocks that are 3.7 billion years old! Paleontologists are people who study fossils. They can learn a lot of different things about an organism, even about their behavior, just by studying its fossils…
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