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Beginning of life in earth

Discussion of everything related to the Theory of Evolution.

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Postby MrMistery » Sat May 14, 2005 6:40 pm

You mean, in the present? I can not think of anything but it probably is a way :lol: :lol

PS: since in my 12th grade textbook the origin of life is under evolution chapter i guess this topic belongs here better:
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Endosymbiotic theory

Postby victor » Sun May 15, 2005 1:04 pm

But, in my textbook (indonesian version.. :lol: ) endosymbiotic theory is under "beginning of life" chapter..Anyway, let's consider it whether in evolution chapter or in the beginning of life chapter. Lynn Margulis is so great in giving her opinion about this matter..he2...thanks and thanks to all of you who reply my question.
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Postby MMGW » Mon May 30, 2005 12:33 pm

Jelanen wrote:And maggots form spontaneously on rotting meat. Hey, just because we proved long ago that spontaneous generation is fallacious doesn't mean we can't resurrect it in a different form and call it a different name....
</sarcasm>

-Jelanen


What we proved was that life does not form spontaneously in short periods of time today. Extrapolating that to the argument that life could not form over millions of years on the early earth is, to say the least, an unjustified generalization.

1. On the early earth, condtions were very different than what we have on earth today. (High oxygen content in the atmosphere being one potentially relevant difference among **MANY**).

2. In the modern world, complex organic molecules tend to be consumed by previously existing organisms. So, living things may very well disturb the conditions needed for life to form.
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Postby mith » Tue May 31, 2005 10:59 pm

note the sarcasm :D
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Postby b_d_41501 » Wed Jun 01, 2005 3:11 am

Directed Panspermia all the way..............nah, not really :-). But I do buy into Panspermia theories. lol
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Postby MrMistery » Wed Jun 01, 2005 7:53 pm

Yes... But it is not something that happens today and you can observe it tomorrow. Cianophora paradoxa is an algae which does not have chloroplasts but has endosimbiotic cianobacteria. In a a milion years they will observe it's grandson and see that it has something resemblant to chloroplasts probably. But we can assist at some form of divergent evolution
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im so glad i found other people who share my passion!

Postby bioluva » Fri Jul 22, 2005 1:56 am

Hi guys! im new on the boards!
i was surfing the net, as i like to do on my saturday evenings, and i found this site! i was so excited!
I couldnt sign in for a while as my glasses were being repaired, by now im ready to discuss urey and miller, my latest fave theory, with you guys- my new best friends!
so what do you guys think about the hare krishna view of Urey/Miller?
Get back to me asap...ill be waiting!
luva ya
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Postby har0bed1813 » Mon Aug 01, 2005 4:35 pm

welcome! Glad there'll be someone more to put some intellegence in my life:P:P
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some thoughts about origin of life

Postby Tanya » Thu Sep 15, 2005 2:10 am

People here were talking about how life started: abiotically or "biotically": I there were times when this separation did not exist; if you look at the physics and chemistry of living structures, you will notice the redox mechanisms (i.e, oxidizing some compounds to get energy, and reducing another in order to create necessary (as a rule, more complex ones) for a living). THe difficulat part to explain is all the complexity of organic machinery (enzymes, and stuf like that) that underlies the redox reactions.
So, I guess at some point the transition from "abiotic " to "biotic" took place, like accumulation of quantitative characters turned into principally new qualitative feature. I think all we need is a new integrated theory of Life origin and understanding of information theory that exist right now.
Could you guys post some interesting weblinks about Life Origin?
Another comment about the panspermia theory. Very interesting indeed, but this only relocate the place of life origin to unknown location: if it did not began on Earth, than WHERE it began? I `d rather consider the Earth as a sutable place.
ALien flies:-) That is a funny one... but here is some data: the earliest life records found is 3.8 bilions years old, and the Earth is 4 bilions ears old itself. In these 0.2 bilions the Earth was lind of a mess (volcanimsm, extreme temperature gradient and so on.. from our today`s human perspective) . MAybe it was invitive for Alines? Who knows.
Anyway, I think it is more interesting trying to create life "in vitro" than just say, oh well, we will never know, how life originated. What you think?
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Postby MrMistery » Thu Sep 15, 2005 7:26 pm

Forum search. We have discussed the origin of life thingy. Plus http://www.chem.duke.edu/~jds/cruise_ch ... sites.html
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