Question: Imprints of the shells of ocean clams are often found in the rocks of the Appalachian Mountains. What do these imprint fossils most likely indicate?

  Options: 
 A. These mountains were once under the ocean.
 B. These mountains once had a more rainy climate.
 C. Mountain river clams evolved from ocean clams.
 D. Ocean clams evolved from mountain river clams.
Answer: A