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PLZ HELP! WILL FAN AND LIKE:) 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
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PLZ HELP! WILL FAN AND LIKE:)

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.

PLZ HELP! WILL FAN AND LIKE:) The diagram below shows the layers in a rock having-example-1
User Zin Win Htet
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Organism X existed for a short period of time is the correct answer.

User Jimmyorr
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A, organism X existed for a short period of time. The organism is only found within a specific layer and never seen again. That is, I'm assuming Z is near the top of the time scale. 
User Taleh Ibrahimli
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