Mr. D was the BEST teacher at Fallston. I had him years ago (20+ yrs) when he first started and is still to this day, my favorite teacher of all! Down to earth, respectable, and challenging.
I had him twice once for biology and again for botany. I hate this guy. Repeated accused me of not doing group work when i did more than my share.
I've had Mr. Dennis twice while at fallston, once for Microbiology and also AP Biology, he was always difficult and dry and shovenist and patronizing
I learned a lot in his microbiology class however it was hard. You definately have to study for his tests. Just show him respect and you'll be fine!
D is a superior teacher. If you listen and do your work, you'll learn alot. The man is the most knowledgable person (both in Bio and out) I've ever known.