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

question 112

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)4.6 billion years
• B)66 million years
• C)541 million years
• D)541 billion years

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