Tác giả: Reid Powell

Tóm tắt: Lesson 122. A look at fireflies and how they glow at night.

Tác giả: Anne W. Phillips; Ill Debra Bandelin, Bob Dacey

Tóm tắt: Lesson 128. Learn about the life that exists under the ground, including insects and roots.

Tác giả: Debra Lucas; Joanne Friar ill.

Tóm tắt: Lesson 126. A story exploring the mystery of missing bird eggs in a nest.