Fossils largely means the remains of decayed plants and animals. Since they are preserved in rocks, they are of the used as a key in determining the age of rocks in which they are found. The fossil which is most likely to be index is E
- Index fossils are usually very distinctive from other fossil types based it's period of occurence and lasting time frame, as it often occurs over a very limited period of time.
- Looking at the table; a distinct fossil which occurred only in one rock layer is the fossil lettered E. This shows that it occured at a certain period of time and did not exhibit a long span line the other fossils.
Therefore, the fossil lettered E is most likely the index fossil.
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