How long did the Proterozoic eon last?
A)approximately 500 million years
B)approximately 1 billion years
C)approximately 2 billion years
D)approximately 4 billion years

Name: How long did the Proterozoic eon last? A)approximately 500 million years B)approximately 1 billion years C)approximately 2 billion years D)approximately 4 billion years
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The Proterozoic eon lasted approximately 2 billion years, spanning from about 2.5 billion years ago to about 541 million years ago.

How Long Did the Proterozoic Eon Last