Mysterious finding: scientists discovered life forms in ancient rocks more than 3000 years old

These organisms, of surprising sizes, could offer new clues about the evolution of life on Earth.

Scientists  have made a surprising discovery by finding fossilized cells in rocks that formed shortly after Earth's birth, about 3.8 billion years ago.

These cells, remarkably different from any other living thing on the planet, have no cell walls and present a complexity that exceeds that of modern cells.

Now, a new study offers a new explanation for the origin of these mysterious structures and suggests that they could be the precursors of modern cells.

What are the cells found in ancient rocks like?

Unlike modern bacteria, which are typically 1 to 2 micrometers wide and lack internal structures, the microfossils found in these ancient rocks are a considerable 60 to 70 micrometers in size.

This unprecedented discovery has been a subject of intense debate among biologists, who question whether these fossils really represent the remains of living cells.

An eye-opening study on bacteria

 Microfossils were first discovered in 1987 and have since been found in different parts of the planet. "They seem too complex," said Dheeraj Kanaparthi, a researcher at the Max Planck Institute for Biochemistry in Germany, in statements collected by New Scientist.

"They're also too big. What we find is always disconcerting," he added.

The recent study by Kanaparthi's team, still pending publication, focuses on bacteria growing around freshwater springs  at the bottom of the Dead Sea.

These organisms are a type of cell without a wall called L-forms, known since the 1930s. It was found that under high salinity conditions, these cells tend to swell and develop structures similar to mysterious microfossils.

How was the evolution of these cells?

The researchers suggest that the saline conditions and the type of salts present in the environment of these primitive fossils could be responsible for the excessive growth of the cells, forming what appear to be internal structures, indicates the article written by Omar Kardoudi.

In different situations, these L-forms grow in long chains that divide into separate cells. "We thought that these cells would grow into big bubbles and then split into a thousand pieces," Kanaparthi explains, adding, "But in reality, they reproduce in a very defined way."

This study provides evidence on:

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• How primitive cells could have inhabited Earth shortly after it cooled  enough to allow carbon-based chemistry.
• The lack of a cell wall in these primitive cells could have influenced their shape and an inefficient method of reproduction.
• In this process of reproduction, much of the content of the stem cell was lost.
• This leakage could explain the carbon deposits found around some microfossils.

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