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

Name: 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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The Cambrian Period began 541 million years ago.

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