Re: Fw: Most popular/common dinosaur misconceptions

[Roberto Takata <rmtakata@gmail.com>]

On 8/19/06, Phillip Bigelow <bigelowp@juno.com> wrote:
> If polyphyletic life *easily* arises in primordial soups throughout the
> universe, then the monophyly of Earth life is indeed interesting.

Possibly. But the genetic pattern shows us that all life that exhist
today are derived from a single common ancestor - the cenancestor or
LUCA.

If there was other living system with independent origin from the
primordial soup - submarine vent, spacial seeds, whatever - at ancient
time, they apparently do not have a single descendant living today.
(Though it could be hide somewhere.)

An alternative proposed by Doolittle and Woese is that the LUCA or its
ancestor could be a chimera of different living system with
independent origin.

[]s,

Roberto Takata