The term which correctly defines the given pictures is Fossil.
A fossil is the naturally preserved remains or traces of animals or plants that lived in the geologic past. It can either be in the form of trace or the whole body preserved.
The significance of fossils in evolution
• Most of the fossils are of extinct organisms, so fossils represent the remains of once-living organisms.
• Fossils show the degree by which organisms have changed over time.
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