Themes: Microscopic Life Forms, Science, Nonfiction, Tween. From oceans and lakes to people's bodies, tiny creatures live everywhere. They are too small to see with the eye. Microscopes make it possible to view their world. Take a closer look at what makes these life forms so amazing. Red Rhino Books Nonfiction is the first Hi-Lo children's nonfiction series at a first-grade reading level for students in grades 4–7. Visually appealing fullcolor photographs and illustrations—along with fun fact boxes—keep these books flowing. Also includes prereading comprehension questions along with a 20-word glossary for further reading support.