INDEX NEXT UP LAST ATG Archaen Archean Eon (4.6BYA-2.5BYA)

Bacteria The Archean Eon begins with the formation of the Earth 4.6BYA (Billion Years Ago). Around 3.9BYA, the first life on Earth in the form of bacteria appeared. Bacteria, the simplest form of life, consists of single-celled organisms without any nucleus, basically bags of chemicals floating about. Cells without nuclei are called prokaryotes in the scientific world. [NS] {PL}

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