alleryAbout how long has life existed on Earth, according to the evidence?
A3.7 billion years
B37 million years
C370 million years
D3.7 thousand years
Answer & Solution
Correct answer: A. 3.7 billion years
1. Evidence suggests life on Earth began long ago.
2. It has existed for about 3.7 billion years.
3. Millions of years would be far too short.
_Source: Wikipedia, Natural environment, Life_
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