The oldest rocks in which evidence of life appears are those of
A) Precambrian time.
B) the Paleozoic Era.
C) the Mesozoic Era.
D) the Cenozoic Era.

Name: The oldest rocks in which evidence of life appears are those of A) Precambrian time. B) the Paleozoic Era. C) the Mesozoic Era. D) the Cenozoic Era.
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Question

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The oldest rocks in which evidence of life appears are those of the Precambrian time, which dates back about 4 billion years, long before the Paleozoic, Mesozoic, or Cenozoic Era.

The Oldest Rocks in Which Evidence of Life Appears Are