The Hadean Explosion?

In recent years, the search for the origins of life is becoming complex. It turns out that oxygen is NOT a requirement for multicellular life to thrive. As stated in this BBC article, poriferans (sponges) can thrive at oxygen levels of just 0.5%. And according to Kitsap Sun, jellyfish do better in low-oxygen waters than fish. And then, of course, there are the loriciferans, a phylum whose common name I can't find. They, too, thrive with little to no need for oxygen.

So this got me thinking. Life first appeared 4.28 billion years ago as single-celled, extremophilic microbes, possibly bacteria or archaeans or both, thriving in a perfectly anaerobic Earth. But a recent discovery has shown that the jump from single-celled to multicellular is not as hard as traditionally assumed. With that in mind, could animals evolve sometime during the Hadean Eon, 4.6-4 billion years ago? Or would something hold them back?

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The Hadean Explosion?

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