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Across 2. There are also some modern amphibian ________ that have adapted to life only in water. 4. The thick, waterproof skin fo reptiles protects them from the environment and from __________ 5. Amphibians living today include frogs, toads, and ___________. 7. Yolk inside the eggs provides developing ___________ with nutrients 8. Ectothermic ___________ transform most of the food they consume directly into energy. 11. Membranes separte the internal parts of the egg, which is covered by a _____________ shell. 13. Amphibians and reptiles are ____________, animals whose body temperatures change with environmental conditions. 14. Other lilve mostly underground, beneath wet leaves, or under decaying _____. 15. Most amphibians live in moist __________________. 17. Some female reptiles, including ____________ guard their nests and care for their offspring after they hatch. 19. Reptile skin is hard, dry and covered with scales made of ________, a substance much like your fingernails. 23. When an animal with lungs inhales, its takes ________ in through its nostrils or mouth and mones the air into its lungs. 24. Tabpoles look and behave like small ________. 26. the larvae of frogs and toads are called ___________. 28. The tadpole begins to have some of the external features of a _______. 29. Like fish eggs, amphibian eggs do not have hard __________.

Down 1. More then 350 million years ago, Earth was already inhabited by many species of _____________ animals. 2. Many ectotherms warm themselves in _______________. 3. Many species of reptiles build or dig _____________. 6. It took millions fo years and many generations before different _________ occurred and amphibians became a distinct group. 9. Therem oxygen is transported across the tissues and into the ___________, 10. Most species of _________live close to watye or in damp places. 12. After_____________, a protective case, or shell, forms around each egg while it is still inside the female's body. 14. Amphibians and reptiles also have behaviors that allow them to adjust their body _____________ in less extreme ways 15. In most amphibian species, a female lays _________ in water, 16. anumals in the __________ group have adaptations that allow them dto survive in hotter, drier places than amphibians. 18. When a young amphibian hatches, it is a ___________. 20. The frog starts using its _________ to capture and eat small anumals. 21. This means developing amphibians can get water and ______ directly from their surroundings. 22. Reptiles include turtles, snakes, _________, and crocodiles. 25. They are born with _________ that provide their bodies with all the oxygen they need. 27. Many animals _________, and food and oxygen become scarce.