Question

what are fossils . defination

Answer 1

A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood, oil, coal, and DNA remnants.

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Answer 2

Fossils are impressions of dead and decayed plants and animals which were buried under the earth millions of years ago under high pressure and temperature.
We can find the age of fossils by 4 ways:
excavation
study of fossils
time dating
study of DNA sequences
Example: coal and petroleum