Which of the following is an essential characteristic of an index fossil?
A) The fossils occur in deep- water marine sediments, but the organism actually lived in the sunlit, surface layer of the ocean.
B) The organism only lived for a short span of geologic time but was very widespread.
C) The fossils are exceptionally abundant for a long time span and readily preserved.
D) The organism lived only in specific environments such as beaches or estuaries.
Correct Answer:
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