The diagram below shows the layers in a rock having a brachiopod:

Which statement about the rock fossils is true?

Organism X existed for a short period of time.
Organism Y became extinct before organism X.
Organism X and organism Y existed at the same time.
Organism Z became extinct much before organism X.

The diagram below shows the layers in a rock having a brachiopod Which statement about the rock fossils is true Organism X existed for a short period of time Or class=