Test My Theory: Macro evolution DOES happen?

[downbeatplumb]

Down my way we have a well respected chemist who actually runs the creationist museum in Portsmouth.
I was at an open meeting where creatoinism was discussed and it became clear that he knew a lot about chemistry but sod all about anything else.
He was quite, quite mad.
Mr Fibble mad.

https://www.youtube.com/watch?v=1KE0njnZXyY

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I agree with pretty much all of that.  I would also consider it to be microevolution or natural variation.  I don't believe that it explains large changes in body plan or morphology.   What is the mechanism or theory, by which these types of changes occur?  Or if understanding is lacking, what is the evidence, that these did occur as the story is told?   We do are best to connect the dots, as evolution tells us, but what tells us, that we should be drawing these lines at all?

This highly regarded chemist says that he doesn't understand it, and seems to say that there is a distinction.

Microevolution over time leads to bigger changes. Its the difference between taking one step down a road and taking many. So an accumulation of small changes leads to big cjanges eventually.
I shall explain this as though to a simple child. If everyday you put a pebble in one spot on the ground over enough time you will have a mountain of stones. Little things accumulate and there has been billions of years of evolution, which sped up exponentially when sex started.