The earliest prokaryotic fossils date back at least _______ years.
A) 35,000
B) 350,000
C) 3.5 million
D) 350 million
E) 3.5 billion

Name: The earliest prokaryotic fossils date back at least _______ years. A) 35,000 B) 350,000 C) 3.5 million D) 350 million E) 3.5 billion
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The earliest prokaryotic fossils have been found in rocks that date back to 3.5 billion years ago. This suggests that prokaryotic life existed on Earth relatively soon after its formation, around 4.5 billion years ago.

The Earliest Prokaryotic Fossils Date Back at Least _______ Years