Originally posted by c guy1
It doesn't make sense to me.
Here is what I think I know about evolution:
The universe always has and always will evolve. It started with some molecules that randomly started evolving because conditions were perfect. The prook for this is in the small difference we see in life(dog breeds, birds getting longer beaks to reach bugs, giraffs getting longe ...[text shortened]... e did start from that DNA, matter, molecules, watever "it" was....where did "it" come from?
Evolution, as I try to give a concise definition of it right now, is pretty hard to encapsulate in an easy sound-bite! Basically, evolution is the process by which new species come about, or the organisms within a species develop new characteristics based upon random mutation, but non-random (but not non-stochastic) death and reproductive success.
Basically, the entire theorum can be simplified into the statement that 'the organisms best suited to an environment will both survive longer than organisms poorly suited to their environment, and have higher reproductive success'.
The second clause is that random genetic mutation may lead (occassionally, in the complex organisms that currently inhabit the planet, but more frequently in the past when organisms were genetically, physiologically, biochemically and ecologically simpler) to organisms being either (a) worse, (b) better, or (c) having no effect on the organisms fecundity.
In order for different species to evolve from a common precursor, two main things are required. The first, is some type of isolation between two populations, such as geographical isolation. This prevents gene transfer between the two populations and, given enough time, will lead to the two populations to become so genetically different that they are no longer able to inter-breed (and produce viable offspring). The second thing (more of a help than an absolute necessity) is a heterogenous environment. This promotes competition between organisms within a species, and only the 'fittest' survive.
That should be enough to get the debate started. I'll get onto abiogenesis next time.