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
Answer: E
Environmental & Atmospheric Sciences
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____________________. Fill in the blank(s) with the appropriate word(s).
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Indicate whether the statement is true or false
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