Life on the earth
Understand the Problem
The question is asking about the concept of life on Earth, which encompasses various biological, ecological, and evolutionary aspects. It invites exploration of how life exists, its diversity, and its significance on our planet.
Answer
Life on Earth dates back 3-3.8 billion years, with 3 Ga being the oldest undisputed evidence.
The earliest undisputed evidence of life on Earth, interpreted as fossilized bacteria, dates back to 3 billion years ago (3 Ga), with other evidence suggesting life existed around 3.5 to 3.8 billion years ago.
Answer for screen readers
The earliest undisputed evidence of life on Earth, interpreted as fossilized bacteria, dates back to 3 billion years ago (3 Ga), with other evidence suggesting life existed around 3.5 to 3.8 billion years ago.
More Information
The fossil records and chemical evidence of life from over 3 billion years ago reveal that life started with simple, microscopic organisms, likely in the form of bacteria or microbial mats.
Tips
People often confuse the age of Earth (4.5 billion years) with the age of life on it; life began significantly later, around 3 to 3.8 billion years ago.
Sources
- History of life - Wikipedia - en.wikipedia.org
- Early Life on Earth – Animal Origins - naturalhistory.si.edu
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