[kimtom]

“...What mechanism stops micro evolution from becoming macro evolution over time?..”

You first bring me proof of evolution.
AND an example occurring today or in past of a species changing into another.

[allmendream]

“proof”. A case in point that you are not qualified to discuss science. There is no proof in science - just evidence.

As for evidence for evolution we see it every day. You would call it micro evolution if you troubled to make yourself aware of the evidence and you were able to even define it.

As for the evidence of common descent of species - we have endogenous retroviral sequences - but I suppose I must explain the evidence to you......

Must I?