Bacteria are a dominant form of life that inhabit every environment on Earth. This includes human bodies, where they outnumber our cells and genes and regulate many body systems. Bacteria are regularly viewed as simple, single-celled organisms. As bacteria are ancient, it is widely accepted that a bacteria-like, unicellular being was the first life. Recent work published in Molecular Biology and Evolution by an international research team challenges these views.
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Source: Phys.org