1. Unit 7 Lesson 2 How Can We Classify Vertebrates? Copyright © Houghton Mifflin Harcourt Publishing Company

2. Unit 7 Lesson 2 How Can We Classify Vertebrates? Florida Benchmarks Copyright © Houghton Mifflin Harcourt Publishing Company SC.3.N.3.2 Recognize that scientists use models to help understand and explain how things work. SC.3.L.15.1 Classify animals into major groups (mammals, birds, reptiles, amphibians, fish, arthropods, vertebrates and invertebrates, those having live births and those which lay eggs) according to their physical characteristics and behaviors.

3. Unit 7 Lesson 2 How Can We Classify Vertebrates? Have a Backbone! Copyright © Houghton Mifflin Harcourt Publishing Company Animals that have a backbone are called vertebrates. Frogs, birds, snakes, tigers, and lions are vertebrates.

4. Fish Fish are vertebrates. Fish take in oxygen through their gills. They spend their entire life in the water. Whale sharks, monkfish, sea horses, and bass are examples of fish. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 7 Lesson 2 How Can We Classify Vertebrates?

5. Amphibian or Reptile? Copyright © Houghton Mifflin Harcourt Publishing Company Amphibians start life in water. They hatch from eggs. They move to land as they grow. Young amphibians start out looking very different from their parents. Young amphibians have gills. Adults have lungs.

6. Unit 7 Lesson 2 How Can We Classify Vertebrates? Amphibian or Reptile? Copyright © Houghton Mifflin Harcourt Publishing Company Most amphibians have smooth, moist skin. Salamanders, toads, and frogs are examples of amphibians.

7. Unit 7 Lesson 2 How Can We Classify Vertebrates? Amphibian or Reptile? Copyright © Houghton Mifflin Harcourt Publishing Company Reptiles are animals with scales covering their bodies. Young reptiles hatch from eggs. Reptiles breathe through lungs their entire life. Lizards, turtles, and crocodiles are examples of reptiles.

8. Unit 7 Lesson 2 How Can We Classify Vertebrates? Birds and Mammals Copyright © Houghton Mifflin Harcourt Publishing Company Birds are vertebrates. They have wings, feathers, and beaks. Birds lay eggs. They breathe with lungs. Hummingbirds, penguins, flamingoes, and golden pheasants are examples of birds.

9. Unit 7 Lesson 2 How Can We Classify Vertebrates? Birds and Mammals Copyright © Houghton Mifflin Harcourt Publishing Company Mammals are animals that have fur or hair. Most mammals give birth to live young and make milk to feed them. Mammals use lungs to breathe. Elephants, apes, whales, seals, dolphins, and bears are examples of mammals.