[Exigence]

This micro/macro evolution distinction has zero scientific backing.

Really? My staunch "evolution explains everything" prof for my undergrad evolutionary biology course said there was a distinction. Even he was intellectually honest enough to admit that -- and to cover the same criticisms of evolution in our course that Kansas science teachers were previously forbidden to utter. Very curious...

[aNYCguy]

My staunch "evolution explains everything" prof for my undergrad evolutionary biology course said there was a distinction.

Please explain to me, in your own words, the distinction between "micro" and macro" evolution. Then please explain to me what force or forces prevents enough microevolutionary changes from summing into macro change.