In the leveled reader Bacteria and Archaea, fundamental science facts of biology are explained through easily understood text and colorful photographs and illustrations. Young readers discover that bacteria and archaea are tiny organisms too small to be seen with only the eyes. Although they look a lot alike, they are different from each other. Bacteria come in three basic shapes: rods, spheres, and spirals and live in different places. Some live alone, while others live in colonies. Archaea come in different shapes, such as a ball with hairs on one side, lumpy ping pong balls, rod shapes, and long hair-like shapes. Archaea can live in very hot or very salty places, and some can even eat iron.

A pronunciation guide of scientific terms is included. 24 full-color pages. Reading Level 1-3, Interest Level 2-5. Word count 277. Lexile measure 470L.