Scientists conclude different ‘Complex’ life forms may have existed on Earth before us

Scientists conclude DIFFERENT ‘Complex’ life forms may have once existed on Earth before our species came into existence.

“This research shows that there was enough oxygen in the environment to have allowed complex cells to have evolved…”

According to scientists, we are not the FIRST complex life forms on planet Earth. In fact, another complex life form existed once but disappeared at some point during Earth’s long history. Then, after a while, complex life forms reappeared.

Mainstream scholars agree that given our ‘current’ knowledge of Earth’s history, complex life appeared on our planet at least some 1.75 BILLION years ago.

A study conducted by scientists from the University of Washington (UW) tells a different story suggesting that around a billion years before life came into existence, complex life developed in Earth’s oceans.

A recent paper published in the in the Proceedings of the National Academy of Sciences –in which lead author Michael Kipp, a UW doctoral student in Earth and space sciences participated in— explored isotopic rations of Selenium located in sedimentary rocks in order to measure the presence of Oxygen in our planet’s atmosphere between 2 and 2.5 billion years ago.

Using Selenium as a tool, experts measured oxygen levels on Earth up to 2.5 billion years ago.

The results are fascinating and show that there was more than enough oxygen for complex life cells to develop on our planet.

Professor Roger Buick from the University of Washington and co-author of the study said:

“There is fossil evidence of complex cells that go back maybe 1 ¾ billion years, but the oldest fossil is not necessarily the oldest one that ever lived – because the chances of getting preserved as a fossil are pretty low.”

“This research shows that there was enough oxygen in the environment to have allowed complex cells to have evolved, and to have become ecologically important, before there was fossil evidence.

However, professor Buick warns not to jump to conclusions.

“That doesn’t mean that they did — but they could have.”

While this is not the first study which explored how much oxygen was present on Earth in the past, it does shed light on how selenium had been altered by the presence of large quantities of Oxygen and how it may have affected the appearance and possible disappearance of complex life on Earth.

In previous studies, scientists concluded that Oxygen appeared on our planet gradually through Earth’s history and it increased up to a level allowing complex life forms to exist.

“But what it looks like now is, there was a period of a quarter of a billion years or so where oxygen came quite high, and then sunk back down again,” Buick explained. This duration is important.

“Whereas before and after maybe there were transient environments that could have occasionally supported these organisms, to get them to evolve and be a substantial part of the ecosystem, you need oxygen to persist for a long time,” said lead author Michael Kipp.


Conditions right for complex life may have come and gone in Earth’s distant past.

Featured image: Tryingtofly

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  1. Getting tired of misleading headlines here. Headline says “Scientists conclude DIFFERENT ‘Complex’ life forms existed on Earth BEFORE us”.

    But the scientist quoted in the article says of the evidence, “That doesn’t mean that they did — but they could have.”
    “Could have” is not the same as “existed.” There is no PROOF to back up the headline. Do I think that there PROBABLY was complex life before present day humans? Absolutely, it is a probability. But probability is not proof.

    1. It’s fine now, Ivan.
      There are too many enigmas on this planet that scientists are having a hard time explaining…Puma Punku, Sacsayhuaman for instance…so I’m convinced that there were other “things” or beings that inhabited this earth prior to us going erect on two legs.

  2. It wasn’t so much as to whether it was “appealing” — I clicked on the link because the headline made me believe that PROOF had been found. Because scientists require proof before they make conclusions. The article itself said that there “could have” been different complex life forms.
    As I said in my original post, I believe there have been different complex life forms before us, or humans (in some form) have existed for much longer than we think. So I’m interested in seeing proof.
    Now, maybe you have to write the headlines that way, to get people to read the articles. But when people read the articles, and find that they don’t support the headline, you take a hit in your credibility.

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