We are reading A World in a Drop of Water, an easy introduction to microscopic organisms:
The text is easy to read and is complemented with lots of large photographs and diagrams. I designed some notebooking pages to go along with the chapter on amoeba.
As always, I love to hear when you use printables from The Notebooking Fairy in your homeschool. If you send me photos, I will feature you in a Show Off post.