Renegade Retard said:
However, they're still fruit flies, though various species of the fruit fly. You can't make a fruit fly change genus and become a housefly or gnat, much less a spider, lizard, or crustacian.
It would take me forever to explain to you the process of speciation and everything it does and all the prove that there is. Hell, it took my teachers 16 weeks, 3 hours a day to explain to me the little I know about speciation now.

I'll say this though: I never said you could turn a fly into a lizard or a crustacian etc. This is not the idea of speciation, the whole idea is that you can produce NEW species with the process of speciation, not already existing ones.
With the proces of speciation you can produce 2 species where you first had one. Those 2 can produce another 2 each, etc etc etc. What you get then is a tree of species, with your original species at the bottom. In the case of a fruit fly, all of this would happen within the box we call a 'genus'.
The whole classification of species, genus, family, order, etc. is something man thought up to explain the biodiversity in the world. Using this man made system to try to disprove a natural occuring process is an elementary mistake.
What I tried to show with my example is that the process of speciation can and does occur. And if we can produce 2 new species in a lab, it's not hard to imagine that nature could produce millions of species by the same process over millions of years. If we would continue producing new species of fruitflies in the lab, everytime taking the new species of the previous experiment, and we would continue this for a hundred years or something, we would probably get a species of fly that is so different fromthe original fruit fly that we would have no choice to give it it's own genus. That's how classification works in respect to speciation.
This has turned out to be more text then I intended, but I've been studying taxonomy and biodiversity for 5 1/2 years now and I just can't stand when somebody makes that elementary mistake that we learned to avoid: using taxonomy to disprove speciation. No offense intended to anyone...
I've got a lot more to say about this subject, but that would just bore you allt ot death

So, in conclusion:
I''m not saying speciation has all the answers, nor that it has been unmistakenly proven that all species we see today evolved from one species or anything. I'm just saying that it has been proven that speciation does occur and therefor it can be considered one of the theories that explain the biodiversity we see today.
I just happen to
believe this is the most correct theory.
P.S. If anyone wants to continue discussing this, let's do it over PM or something
