When did the earliest organisms appear on earth?
The earliest known life forms on Earth are putative fossilized microorganisms found in hydrothermal vent precipitates. The earliest time that life forms first appeared on Earth is at least 3.77 billion years ago, possibly as early as 4.28 billion years, or even 4.5 billion years; not long after the oceans formed 4.41 billion years ago, and after the formation of the Earth 4.54 billion years ago. The earliest "direct" evidence of life on Earth are microfossils of microorganisms permineralized in 3.465-billion-year-old Australian Apex chert rocks.
When is the earliest time that the earliest organisms possibly appear on earth?
4.54 billion years ago 4.5 billion years
Earliest known life forms
The earliest known life forms on Earth are putative fossilized microorganisms found in hydrothermal vent precipitates. The earliest time that life forms first appeared on Earth is at least 3.77 billion years ago, possibly as early as 4.28 billion years, or even 4.5 billion years; not long after the oceans formed 4.41 billion years ago, and after the formation of the Earth 4.54 billion years ago. The earliest "direct" evidence of life on Earth are microfossils of microorganisms permineralized in 3.465-billion-year-old Australian Apex chert rocks.
When is the latest time that the earliest organisms possibly appear on earth?
3.77 billion years ago
Earliest known life forms
The earliest known life forms on Earth are putative fossilized microorganisms found in hydrothermal vent precipitates. The earliest time that life forms first appeared on Earth is at least 3.77 billion years ago, possibly as early as 4.28 billion years, or even 4.5 billion years; not long after the oceans formed 4.41 billion years ago, and after the formation of the Earth 4.54 billion years ago. The earliest "direct" evidence of life on Earth are microfossils of microorganisms permineralized in 3.465-billion-year-old Australian Apex chert rocks.
When did the earliest organisms appear on earth that we have direct evidence for?
3.465-billion-year 3.465-billion-year-old
Earliest known life forms
Earliest known life forms
https://en.wikipedia.org/wiki/Earliest%20known%20life%20forms
The age of the Earth is about 4.54 billion years;[49][50][51] the earliest undisputed evidence of life on Earth dates from at least 3.5 billion years ago.[52][53][54] Some computer models suggest life began as early as 4.5 billion years ago.[4][5]
A December 2017 report stated that 3.465-billion-year-old Australian Apex chert rocks once contained microorganisms, the earliest direct evidence of life on Earth.
A December 2017 report stated that 3.465-billion-year-old Australian Apex chert rocks once contained microorganisms, the earliest direct evidence of life on Earth.
A December 2017 report stated that 3.465-billion-year-old Australian Apex chert rocks once contained microorganisms, the earliest direct evidence of life on Earth.
The earliest time that life forms first appeared on Earth is at least 3.77 billion years ago, possibly as early as 4.28 billion years,[2] or even 4.41 billion years[4][5]—not long after the oceans formed 4.5 billion years ago, and after the formation of the Earth 4.54 billion years ago.[2][3][6][7] 
A December 2017 report stated that 3.465-billion-year-old Australian Apex chert rocks once contained microorganisms, the earliest direct evidence of life on Earth.
The earliest undisputed evidence of life on Earth dates from at least 3.5 billion years ago.Some computer models suggest life began as early as 4.5 billion years ago. A December 2017 report stated that 3.465-billion-year-old Australian Apex chert rocks once contained microorganisms. 3.77 billion years ago is the earliest time that life forms first appeared on Earth.