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animals move beak beaver birds body cars cereal Chapter Review Thinking chart Checkpoint concept map Copy the concept cover goggles Design an activity Developing Thinking Skills Discover Activity earthworm energy exoskeleton Explain file card fish Follow This Procedure food chain forest fuel Gather These Materials gila woodpecker graph grow habitat happens hearing aids heat engine help keep ice cube insects insulators kinds know about scientific LESSON living things Look louder Materials Picture mealworms megaphone methods to find microphones muscles natural resources nest nutrients paper towel petroleum Picture A Picture Picture C Record pitch plants and animals plastic pollution rain Record your observations Record Your Results Review Thinking back rubber band scientific methods seeds simple machines soil Sonoran Desert sound travel sound waves survive Take Action temperature trash trees Try this activity tuning fork vibrate warm water cycle winter