[varmintman]

What stops microevolution for evolving into macroevolution?

Reality (the basic laws of mathematics, genetics, probability etc.)... Why?

[DevNet]

Please explain.

[atlaw]

What stops microevolution from evolving into macroevolution?

Reality (the basic laws of mathematics, genetics, probability etc.)... Why?

I see. So the "basic laws" of stuff just kick in and put a stop to that evolutionism thingy before it goes too far and winds up with crazy concoctions like birds that swim and mammals that fly and fish that walk. I'm glad that's settled.