Hey RAZD,
I've been away for awhile. Looks like this thread needs me. A real live creationist. And with answers to your questions....
razd writes:
The whole system was supposedly set up during those original 6 days, so there must be a mechanism in place that prevents "macro"evolution ... what is the built-in biological mechanism that prevents this from happening? Where is it located? Why hasn't it been found?
The "mechanisms" that you are looking for are in all living organisms, and all of them have been discovered and are well documented. That is the answer to the last two questions.
So what are the mechanisms that prevent or limit the evolution of different biblical "kinds" of animals...
1. Death by mutation
2. Disease by mutation
3. Sex
4. Speciation
5. Protein folding - this may come under disease or death.
6. Genetic capacity
There is a list of six biological mechanisms that are fully known to limit or prevent evolution beyond a certain levels. To assert that evolution via natural selection or genetic drift doesn't have any limits is just absurd. There are many limits that would have to be hurdled to make new genes. These hurdles limit evolution.
PS. #6 is not well understood or defined, but it is written about much. A capacity is a limit.
Edited by AlphaOmegakid, : No reason given.