This is the Protist Lab I use in my general Biology class. The students visit 12 different sites and read about various protists. After the students complete the online portion, I have them look at four protist microscope slides of their choice. When the protist is under clear view, they call me over and I initial their paper (and make sure they're seeing an actual protist, not just junk on the slide!).
The answer key IS included for this lab. Please download the preview for more information and screenshots of the web/lab!