2006-09-14 09:11:20 · 6 answers · asked by jen v 1 in Science & Mathematics ➔ Biology
That was at the end of the Archean, about 2.5 billion years ago.
2006-09-14 09:19:49 · answer #1 · answered by minefinder 7 · 2⤊ 0⤋
One of the question with the worst phrasing EVER!
I think you want to know around when did Oxygen appeared in the atmosphere.
Well, the apparition in concordant with the first photolytic bacterias and algae to use CO2. They started releasing O2 from CO2 and a balance was reached later to become the current atmosphere.
2006-09-14 16:19:55 · answer #2 · answered by TonySti 2 · 0⤊ 0⤋
Its not really free.You have to pay Federal tax on it
2006-09-14 16:14:00 · answer #3 · answered by Pauline 5 · 0⤊ 0⤋
I think it was Thursday of last week.
2006-09-14 16:13:08 · answer #4 · answered by Anonymous · 0⤊ 0⤋
since earth was born my friend.
2006-09-14 16:38:16 · answer #5 · answered by XxX.HateDoll.XxX 2 · 0⤊ 1⤋
when the earth was created......!!!!! as simple as that.....
2006-09-14 16:42:31 · answer #6 · answered by faisal b 1 · 0⤊ 0⤋