The oldest known fossils are from about ______ years ago.
A) 3.5 billion
B) 6,000
C) 4.0 million
D) 1.0 billion

Name: The oldest known fossils are from about ______ years ago. A) 3.5 billion B) 6,000 C) 4.0 million D) 1.0 billion
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The oldest known fossils are stromatolites, which are believed to have formed around 3.5 billion years ago. These fossils provide evidence of the earliest life forms on Earth, which were simple bacteria-like organisms.

The Oldest Known Fossils Are from About ______ Years Ago