unit 2 Science 3 Study note

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Name Lesson 1 Summary Use with pp. 39–43 Lesson 1: How are animals grouped? Vocabulary trait a body feature passed onto an animal from its parents vertebrate animal with a backbone What All Animals Need are amphibians. Many amphibians spend All animals need food, water, oxygen, and part of their lives in water and part on land. shelter to live. Animals can drink water or get Most young amphibians live in water and water from the foods they eat. All animals get their oxygen through their moist skin need oxygen, which is a gas in the air. Most and gills. As they grow, most amphibians animals that live on land have lungs to develop lungs to breathe. breathe in oxygen. Many animals that live Reptiles usually have dry, scaly skin. They in water have gills to breathe in oxygen. have lungs to breathe air. Snakes, lizards, Animals eat plants or other animals for food. and turtles are reptiles. Shelters protect animals from the weather Birds have bills and feathers. They do and other animals. Some animals build not have teeth. Birds breathe air through shelters. Others have their own hard shells as lungs. Wings and light bones help birds fly. homes and to protect them. Feathers help keep birds warm. Most mammals have hair to keep them Ways of Grouping Animals warm. Mammals breathe air through lungs Sometimes we group animals by where and feed milk to their babies. they live or how they act. We can also group Animals Without Backbones animals by how they look. A trait is a body feature that is passed onto an animal from Most animals do not have skeletons made its parents. Traits can also be things an of bone inside their bodies. These animals animal does. are called invertebrates. Sea jellies, worms, An animal might be placed in more than mollusks, and arthropods are the major kinds one group. For example, we can group of invertebrate animals. Many mollusks animals by what they eat. Snakes, hawks, have a soft body inside a hard outside shell. and owls eat mice. Hawks and owls are also Octopus, clams, and snails are mollusks. in a group of animals that can fly. Arthropods are the largest group of animals without backbones. Arthropods wear their Animals With Backbones skeletons outside their bodies. They have legs An animal with a backbone is called with joints. Spiders and crabs are arthropods. © Pearson Education, Inc. 3 a vertebrate. Cats, dogs, and birds are Shells and skeletons outside the body vertebrates. Fish and snakes are vertebrates would weigh too much on big animals. So too. Vertebrate animals can look different, animals without backbones cannot grow as but they all have backbones. large as vertebrates. There are five groups of vertebrates. Fish, Most sea jellies live in the ocean, while amphibians, reptiles, birds, and mammals worms live in the soil. A small area of soil are the five kinds of vertebrates. Fish spend can have several million roundworms. There their lives in water. Most fish have scales are more animals without backbones than and breathe through gills. Frogs and toads animals with backbones. 12 Chapter 2, Lesson 1 Summary Quick Study

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