For about the last ________ years, Earth has had about the same balance of chemical components that now persists.
A) 10,000
B) 100,000
C) 1 million
D) 500 million
E) 1 billion

Name: For about the last ________ years, Earth has had about the same balance of chemical components that now persists. A) 10,000 B) 100,000 C) 1 million D) 500 million E) 1 billion
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Earth has had about the same balance of chemical components that now persists for about 1 billion years.

For About the Last ________ Years, Earth Has Had About