The fossil evidence found in these sedimentary layers best implies that

So technically the answer is B) Animals evolved bony skeletons after shells.

Explanation:

The fossil evidence found in these sedimentary layers indicates that animals evolved bony skeletons after shells. The layers and the Law of Superposition tell us that the youngest organisms are found in the upper layer; the oldest organisms in the bottom layer. The bottom two layers contain invertebrate marine animals with shells; the third layer from the bottom contains bony fish.

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a

explanation: