The characteristic of a good index fossil is the organism lived only during a short part of Earth's history.
Index fossils are fossils that are used to identify and describe geologic periods.
Index fossils have a narrow vertical range, a large geographic distribution, and quick evolutionary tendencies.
These fossils are of the animals who lived for a short period of time.
Thus, the correct option is C. The organism lived only during a short part of Earth's.
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