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Table of Contents
Investigation 1: Origin of Seeds The Reason for Fruit 3 The Most Important Seed 8 Barbara McClintock 12 Nature Journal—How Seeds Travel 16 Investigation 2: Growing Further Germination 22 Life Cycles 26 Investigation 3: Meet the Crayfish Crayfish 34 Adaptations 42 Life on Earth 50 Inside a Snail’s Shell 64 A Change in the Environment 66 Food Chains 70 Investigation 4: Human Body The Human Skeleton 74 Barn Owls 78 Fossils 81 Skeletons on the Outside 89 Crayfish, Snails, and Humans 91 Your Amazing Opposable Thumbs 93 Joints and Muscles 94 Fingerprints 100 Supertwins 104 References Science Safety Rules 106 Glossary 107 Index 1101