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The diagram below shows the layers of a rock having an ammonite:

Which statement about the rock fossils is true?

Fossil Y is older than fossil X.
Fossil Z is younger than fossil Y.
Fossil Z existed over many periods of time.
Fossil Y existed during the same period as the ammonite.

The diagram below shows the layers of a rock having an ammonite Which statement about the rock fossils is true Fossil Y is older than fossil X Fossil Z is young class=