Learning material introduces us the way of life and nature. • Shows trophic levels of living things in pyramid diagram. • Consists of various creatures in diverse ecosystems; rainforest, river, sea, desert, the South Pole. • Describes trophic levels; tertiary consumers, secondary consumers, primary consumers, producers, and decomposers. • Summarizes ecological relationships in a handy diagram. • Vocabulary in Thai-English. • Beautiful design and illustrations. • Suitable for junior high school students age 12-14 years • Can be used as learning material and house decoration.