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Momin Bin Shahid · Answer 1 · 2020-11-07T11:54:20+0000

Answer:

B) The shells present went through gradual changes and were present in all layers.

Explanation: The shells present went through gradual changes and were present in all layers. If you compare the layers, you can see gradual changes between the shells from 2, 3, 4, & 5.

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