2011-10-28 10:57:51 UTC
We know evolution is not an “intelligent” process. Here’s what we’ve got:
The species X can survive in its environment quite well.----------> The conditions change and become unfavorable --------->Two things might occur. Which one is more liekly to ocur and why?
1. A genetic mutation occurs by chance and helps one of the offspring survive; it grows up in all those unfavorable conditions, gives birth to other children and by chance the then-unnatural trait is passed on to the offspring; they survive also and pass it onto their offspring and so on.
2. Before a positive mutation occurs, all the species become extinct under the unfavorable conditions, because they don’t have time for some sort of miraculous mutation that can be passed on for the next generations. They’ll be long extinct before any positive changes become stable.