Dear A ,
We were excited at the prospect of reading--and possibly publishing--a comic strip. It's always nice to have a good chuckle, as I'm sure our readers agree. Your piece, though has flaws.
For one it's not a comic strip. Upon closer reading of your cover letter I notice that you say it is merely a "suggestion for a comic strip." We don't publish mere "suggestions!"
Number two. I think it'd be funnier if your descriptions mirrored the scientific sophistication of the individual being described. The professor should be described as "a metastable allotrope of carbon arranged in a variation of the face-centered cubic diamond lattice crystal structure."(1) Then you would be "a lumpy bit of sandstone, kinda mashed together".
As it was no diamond in the rough, your piece is rejected.