How do fossils provide evidence of past life

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Fossils are a record of living things preserved in rock layers,

Explanation:

Fossils are the remains or evidence of living things. fossils can be actual preserved organic material (amber, frozen masadons.) mineralized bones, and shells, casts, molds, impression of leaves and footprints.

By studying the remains of living things an idea of what the living things were like and some idea of the environment in which they lived.