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The structures of fossils resemble many present-day organisms, so paleontologists infer that they had the same ancestors.
Who are paleontologists?
A paleontologist is a scientist who focuses on the fossil record to learn about the evolution of life on Earth. The existence of fossils, such as those created from animal remains or their impressions, is proof of previous life on the earth.
Organisms or their actions leave behind fossils. The direct remains of calcified tissues from live animals are fossilized shells or bones. Soft tissues, such as chemical remnants of anatomical structures or mineralized remains of the tissues themselves, can show specific facets of anatomy and behavior.
A lineage's forebears and descendants are shown by a temporal order of fossils belonging to the same morphological species. This type of sequence sheds light on how the shape and abundance of various populations have changed over brief periods of geologic time in a specific area. The ecological community that existed in a specific location and time in the distant past can be learned from individual fossil assemblages that contain the remains of numerous different species.
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