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Complex, Invertebrate, Life Forms Are Common as Fossils, Beginning with Marine

Question 32

Multiple Choice

Complex, invertebrate, life forms are common as fossils, beginning with marine strata of Cambrian age. How long ago did the Cambrian Period begin?

A) 65 million years
B) 542 million years
C) 4.6 billion years
D) 542 billion years

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