2006-06-14 10:05:30 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Biology
The earliest living organisms were single-celled. They were prokaryotes, probably bacteria or archaea. They lived 3.8 billion years ago in the Eoarchean Era, a subdivision of the Archean Era.
2006-06-17 14:05:59 · answer #1 · answered by Professor Armitage 7 · 1⤊ 0⤋
Archaea. They predate modern bacteria, eukaryotes and prokaryotes.
See http://tolweb.org/tree/phylogeny.html
2006-06-14 17:08:22 · answer #2 · answered by kurtrisser 4 · 0⤊ 0⤋
Most likely methanogens; prokayotic unicellular anaerobes. There were no aerobic bacteria until the appearance of cyanobacteria, which were the first photosynthetic organisms.
2006-06-14 17:12:11 · answer #3 · answered by nerd_at_heart 3 · 0⤊ 0⤋
Bacteria-like organisms, single celled and heterotrophic, anaerobic, living on the rich nutritious waterbodies, most likely with RNA as coding acid, instead of modern DNA.
2006-06-14 20:33:17 · answer #4 · answered by pogonoforo 6 · 0⤊ 0⤋
Maybe the first living thing wasn't cellular, at all. It just floated freely in a vat of primordial ooze, replicating itself.
2006-06-14 17:12:21 · answer #5 · answered by wordnerd27x 4 · 0⤊ 0⤋
prokaryotic cyanobacteria 3.5 billion years ago
2006-06-14 17:08:06 · answer #6 · answered by loligo1 6 · 0⤊ 0⤋
single cellular eukaryotes
2006-06-14 17:09:24 · answer #7 · answered by Jess♥ 3 · 0⤊ 0⤋