(Since I'm in 8th grade) If I had a Science teacher with a Kingsnake that has improper husbandry, this is what I'd most likely say (and this is just me, I normally don't take good approaches I just let out whatever is on my mind):

Hey, I have a Kingsnake at home and I've owned Kingsnakes for quite some time now and it seems like your Kingsnake doesn't really have a proper setup. When a snake/reptile does not have a proper setup, it can become stressed and as well as catch diseases or parasites. When reptiles do not have a heat source, they cannot get the body heat they need since they are cold-blooded animals. They need a heat source to be able to maintain correct body temperature but if they don't and they are cold it can lower their immune system allowing bacteria to enter the body causing a disease like a respiratory infection which is fatal if not treated with proper antibiotics. I suggest that the best thing to do would be to start researching the specific snake you have to learn how to properly care for it.

Ya, I think that would be sort of a rude approach, but maybe from that you could get some ideas on what to tell your teacher.