Question

1. what is one example of an index fossil?

a tooth
a meteor
a trilobite
a rock

Explanation:

Index fossils are fossils of organisms that existed for a relatively short period of geologic time and were widespread. Trilobites are well - known index fossils as they were abundant, had a wide distribution, and existed for a specific time period in the past. A tooth (from an unknown organism without the context of being part of a well - defined short - lived and widespread species), a meteor (not a fossil), and a rock (not a fossil of an organism) do not fit the definition of an index fossil.

Answer:

C. a trilobite