Here is a worksheet on the Greek word roots gam/o, gamet/o, and -gamy. This is a complicated but nonetheless productive set of roots that mean marriage, sexual union, gamete, and united. Science teachers, I would guess that some of these words turn up in your classroom.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.