The earliest evidence of life on Earth dates back at least 3.8 billion years ago, according to Wikipedia. The earliest life forms were microscopic organisms that left signals of their presence in rocks about 3.7 billion years old. 

Some scientists believe that life originated near a deep sea hydrothermal vent. The chemicals found in these vents and the energy they provide could have fueled many of the chemical reactions necessary for the evolution of life. 

The origins of life cannot be dated precisely, but there is evidence that bacteria-like organisms lived on Earth 3.5 billion years ago. These early organisms must have been simpler than the organisms living today.

We do not yet know how, where, or why life first appeared on our planet. Part of the difficulty is that “life” has no strict, universally agreed-upon definition

According to NASA, life on Earth began around 3.8 billion years ago at the end of the late heavy bombardment period. However, the oldest known fossils on Earth are only 3.5 billion years old. 

The earliest life forms on Earth were microscopic organisms, or microbes, that left signals of their presence in rocks about 3.7 billion years old. These signals consisted of a type of carbon molecule that is produced by living things. 

Scientists think that by 4.3 billion years ago, Earth may have developed conditions suitable to support life. However, the oldest known fossils are only 3.7 billion years old

The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. The signals consisted of a type of carbon molecule that is produced by living things

life on Earth began around 3.8 billion years ago at the end of the late heavy bombardment period. The earliest known fossils on Earth date from 3.5 billion years ago. 

The late heavy bombardment (LHB) is a hypothesized astronomical event that may have occurred approximately 4.1 to 3.8 billion years ago. During this time, a large number of asteroids and comets may have collided with the inner Solar System’s terrestrial planets

The LHB may have been key to delivering water to Earth. Models show that when the planet formed, it was too hot to hold onto water. Instead, water must have been delivered by other means. 

The exact process of how life began on Earth remains a mystery, but the prevailing theory suggests that life began with simple organic compounds. Some people think it started in hydrothermal vents at the deepest, darkest, warmest parts of the ocean.

Around 3.8 billion years ago, the first land masses emerged from the water on Earth. Plate tectonics began, and the foundations were laid for further geological development and the emergence of more complex life forms. 

The oldest rocks with fossil evidence of life on Earth are 3.8 billion years old. These rocks are rare because subsequent geologic processes have reshaped the surface of our planet. 3.8 billion-year-old rocks with fossils can be found in Africa and Australia. 

Life on Earth 3.8 billion years ago consisted of one-celled organisms similar to present-day bacteria. From 3.9 to about 1.2 billion years ago, life was confined to microbes, or single-celled organisms. During this time, the microbes prospered, gradually altering their surroundings.

Life has existed on Earth for 82.6% of the planet’s history. This is because the Earth is around 4.6 billion years old, and life began at least 3.8 billion years ago

The oldest undisputed evidence of life on Earth is fossilized bacteria that dates back 3 billion years. Other finds in rocks dated to about 3.5 billion years have been interpreted as bacteria. 

The earliest life forms were microscopic organisms that left signals of their presence in rocks about 3.7 billion years old. The signals consisted of a type of carbon molecule that is produced by living things. 

Multicellular life did not evolve on Earth until around 600 million years ago. This means that for many living organisms we see today that are multicellular, they were on the Earth for less than 13% of the time.

According to some research, Earth became more habitable 3 billion years ago. 

Scientists believe that Earth may have developed conditions suitable for life by 4.3 billion years ago. However, the oldest known fossils are only 3.7 billion years old. 

Some say that Earth’s climate has remained continuously habitable for 3 or 4 billion years. 

3.5 billion years ago, Earth was a young planet still cooling from its formation. The surface was marked by a volatile environment, with intense volcanic activity and a largely molten surface

The only life that existed on Earth 3.5 billion years ago was bacteria. The oldest known fossils are cyanobacteria from Archaean rocks of western Australia, dated 3.5 billion years old

These bacteria didn’t need oxygen to survive, which was beneficial in a early Earth with little free oxygen. They created sedimentary structures called stromatolites. 

The oldest fossils of single-celled organisms, from Pilbara in Western Australia, date from this time. They may live in freshwater hot springs in a volcanic region on land

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