The abundant remains of ammonites in Oklahoma indicate
A. that Oklahoma was in the past a vast desert with almost no rainfall.
B. that Oklahoma was in the past part of a mountain range that has now eroded.
C. that Oklahoma was in the past covered by a shallow ocean.
D. that Oklahoma was part of a vast tropical forest.
E. that Oklahoma was always a grassland.
Answer: C. that Oklahoma was in the past covered by a shallow ocean.
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