2006-10-03 04:58:45 · 22 answers · asked by husna u 1 in Science & Mathematics ➔ Physics
about 5 billion years ago,
when in the primordial soup amino acids joined together to make the first proteins.
2006-10-03 05:01:51 · answer #1 · answered by Mr.happy 4 · 1⤊ 0⤋
The best estimate of the origin of the Universe, from the Wilkinson Microwave Anisotropy Probe, is 13700 million years ago (13.7 Ga). However, at least one subsequent cycle of star birth/death is required for nucleosynthesis of the C, N and O essential to life, and this process may have taken up to several Ga to produce sufficient quantities (Gilmour et al., 1997). This puts the earliest possible emergence of life in the Universe at ~12.7 Ga, although there is large uncertainty in the length of the necessary time period.
2006-10-03 05:16:58 · answer #2 · answered by Anonymous · 0⤊ 0⤋
It depends on who you ask. As mentioned by an earlier answerer, fossil evidence suggests single celled organisms around 3.5 billion years ago. Interestingly enough, complex multicellular organisms don't appear until around a half a billion years ago. Young earth creationists will tell you that life began 6000 years ago when it was magically created by God.
2006-10-03 05:24:53 · answer #3 · answered by Link 5 · 0⤊ 0⤋
At 40.
2006-10-03 05:00:02 · answer #4 · answered by babyeddieuk 3 · 0⤊ 0⤋
Nobody knows but we know that most of life's history involved the biochemical evolution of single-celled microorganisms. We find individual fossilized microbes in rocks 3.5 billion years old.
We can identify multicelled fossils only in rocks younger than 1 billion years.
2006-10-03 05:02:53 · answer #5 · answered by Henry 5 · 0⤊ 0⤋
About 6 thousand years ago
2006-10-03 10:37:26 · answer #6 · answered by a Real Truthseeker 7 · 0⤊ 0⤋
At about 8:00 this morning. I have no recollection of any events before this time.
2006-10-03 05:01:17 · answer #7 · answered by Anonymous · 0⤊ 0⤋
With Adam and Eve
2006-10-03 05:14:32 · answer #8 · answered by Benno 2 · 0⤊ 0⤋
Scientifically speaking, around 4 billion years ago. Spiritually speaking, when God had an idea.
2006-10-03 05:00:32 · answer #9 · answered by Isis 7 · 0⤊ 1⤋
I'm guessing...maybe a couple milion years before te first dinosaurs?
2006-10-03 05:00:53 · answer #10 · answered by Anonymous · 0⤊ 0⤋