What is an index fossil?(1 point) Responses..

a fossil left during a mass extinction event
a fossil of a footprint or other trace made by an organism
a fossil of an organism from a species that did not live for very long
a fossil in igneous rock

1 answer

An index fossil is a fossil of an organism from a species that did not live for very long. Index fossils are used by geologists and paleontologists to date and correlate the age of rock layers.

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