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4. What group of animals has feathers? 27 Chapter 2 • Lesson 1 How can we classify animals without backbones? There are many kinds of animals that do not have backbones. Some of these animals have shells or hard body coverings that help keep them safe. wings The dragonfly has a hard body covering. It uses its wings to fly away from enemies. C claws A The lobster has a hard body covering. It uses its claws to break open food. legs The beetle has a hard shell. It has three body parts and six legs.

C 28 Animal Life Cycles Some animals without backbones do not have shells. They have soft bodies. These animals must use other ways to stay safe. These jellyfish do not have shells. They sting other animals to stay safe. C Quick Check Write about two ways that animals without backbones can stay safe. 5. com 29 Chapter 2 • Lesson 1 Lesson 2 Mammals How does a mammal grow and change? All animals go through a life cycle, just like plants. Different kinds of animals have different life cycles. Panda Life Cycle 1.

Hardness is how tough a mineral is. Talc is a soft mineral. You can scratch it with your fingernail. Diamond is a hard mineral. It can only be cut by another diamond. A Talc is the softest mineral. D Diamond is the hardest mineral. Quick Check 4. List three properties of minerals. com 53 Chapter 3 • Lesson 1 Lesson 2 Rocks Change How do rocks change? Most rocks are very hard, but they can change their size and shape. Weathering is the way water and wind change rocks. When water gets into the cracks of rocks, it can freeze and push against the rocks.

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