Text 1263, 128 rader
Skriven 2004-12-31 10:55:00 av Deowll (1:278/230)
Ärende: Re: Evolution and other p
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"Anthony Cerrato" <tcerrato@optonline.net> wrote in message 
news:cqvso9$1a2p$1@darwin.ediacara.org...
>
> "deowll" <deowll@bellsouth.net> wrote in message
> news:cqthlt$hrj$1@darwin.ediacara.org...
>>
>> "Matt" <matthew-cantrell@uiowa.edu> wrote in message
>> news:cqo24o$1prk$1@darwin.ediacara.org...
>> >
>> > While I do believe there is life on other world's (Not
> X-Files Style)
>> > the chances of it being similar to here is slim to none.
> Species here
>> > evolved the way they did due to their environments.  For
> example
>> > dinosaurs might still be roaming around if an asteroid
> had not crashed
>> > into earth a few million years ago.  Most people think
> that liquid
>> > water is the key to life, however the the thermal vents
> in the bottom
>> > of the ocean have shown that life can thrive in even the
> most
>> > unhospitable of conditions (ie living of hydrogen
> sulfide gases).
>>
>> They still have liqued water. They are most certainly
> using surprising
>> energy sources. I think I've read that about a third by
> mass of all life may
>> be living in crakes in rocks much of it completely
> unaffected by us.
>>
>> > Species on this planet come and go everyday, many before
> they are even
>> > discovered (paradoxical yet true)While evolution is
> thought to be a
>> > very slow process which Darwin yanked from the geology
> work of Charles
>> > Lyell's concept of uniformitarianism, evolution can ocur
> quite quickly
>> > as in the case of punctuated equilibra where a dramatic,
> sudden change
>> > in the envirnoment creates an excess of resources where
> species that
>> > have the best natural selection capabilites can
> flourish. (food,
>> > nesting space less competition)If you are interested in
> this take a
>> > look at the work of Stanley Miller's groundbreaking work
> in the 1950's.
>> > Basicly he showed in a very simple experiment how the
> building blocks
>> > of life were formed from the environment that was
> available when the
>> > earth was at it's earlier stages.  Cool Stuff.
>> >
>> >
>> The question remains. How different is multicellular life
> likely to be on an
>> Earth like planet with metazoans? Earth has come up with a
> great many
>> answers but trying to come up with something radically
> different that would
>> work might be a challenge.
>
> On the majority of near-Earthlike planets (which themselves
> are likely rare,) multicellular life will probably never
> even develop. Ward and Brownlee believe life is abundant,
> but complex life is rare. There are good arguments for this.
> The few exceptions will be very vulnerable to geophysical
> and various other differences from planet Earth, no matter
> if they are "similar." It is the so-called "Butterfly
> Effect" from chaos theory--i.e., a small flap of the wing of
> a butterfly in Asia can have ultimate gigantic effects on
> the US with time. There are a googolplex number of
> evolutionary paths available for life, even for near-Earths.
> Some _may_ be "similar" to some extent to Earth's history,
> but _most_ will not.
> Anyway, bacteria or their analogs will always dominate the
> galaxy. :)              ...tonyC
>

If conditions are at all stable and the life lasts a fair length of time and 
the energy and nutrient sources are decent one can expect metazions of some 
sort to show up but I agree with you. Microbes are the dominate life form in 
the Universe. They have been on Earth for as long as life has been around 
and can expect to continue to be for some time. ?8^)

>> >
>> > Perkowski wrote:
>> >> Quick question...
>> >>
>> >> If life can possibly exist on other planets that are
> similiar to
>> > Earth,
>> >> what are the chances of animal and plant life on those
> planets
>> > following
>> >> the animal and planet life here on Earth?
>> >>
>> >> For example, could a planet somewhere in our galaxy be
> the home
>> >> of past creatures like the dinosaurs that appeared here
> on Earth?
>> >>
>> >> All things being equal, would animals/plants on other
> world follow
>> >> the same evolutionary map that animals/plants on Earth
> do?
>> >>
>> >> Joe Perkowski
>> >
>> >
>>
>>
>
>
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