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In biology, adaptation has three related meanings. Firstly it is the dynamic evolutionary process that fits organisms to their environment, enhancing their evolutionary fitness. Secondly, it is a state reached by the population during that process.

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a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.

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matter that settles to the bottom of a liquid; dregs.

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the action of preserving something.

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so frightened that one is unable to move; terrified.

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the branch of science concerned with fossil animals and plants.

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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, hair, petrified wood, oil, coal, and DNA remnants.

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Fossil Evidence. Fossils are essentially clues that have been left behind by various forms of living things. They are instrumental tools for understanding the diverse groups of organisms that have inhabited our planet at one time or another. A fossil is any preserved evidence of an organism.

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The taxonomic classification of trace fossils parallels the taxonomic classification of organisms under the International Code of Zoological Nomenclature. ... However, the binomial names are not linked to an organism, but rather just a trace fossil.

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Fossils help to prove that these organisms existed. They also help to show how a species has changed over time. The characteristics of fossils depends on the type of fossil. Mold fossils are impressions that are made in a substrate (often sedimentary rock).