via Amazon.com
As an Amazon Associate I ought to earn from qualifying purchases.
Models are very helpful in a classroom, lecture theatre or lab, and can be good for focussing attention on a topic. They lend themselves to a
variety of hands-on activities.
Being 3-dimensional and perhaps able to be taken apart, they bring more to the subject than a book or a picture can!
Some smaller models can be useful with revision and learning at home, but these are sometimes not so robust.
I have also put in a few links to charts and posters
Amazon removed support for the smaller text + image links I have displayed for years, so I have replaced them with different links which bring up a variety of choices, some of which may wander away from the products I thought were suitable . . .