Review the ancient layers of the Earth in which geologists have found fossils. Remember, that the oldest layers are at the bottomthe younger layers toward the top. How would you describe the sequence of events in this part of the Earth based on the fossil evidence?

A) Life began in the ocean and moved to land by layer #6.
B) Layer #1 shows that there was life underwater. Layer #6 shows that all life became extinct.
C) All life in these layers existed underwater; animals with arrived during layer #3 in Earth's history .
D) The first animals found in layer #1 had no bones; the animals in layer #3 had bones; animals in layer #5 lived on land.

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