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Across 1. an instrument that measures the temperature of something 3. animals that have backbones 5. a measure of heat 7. animals such as frogs, toads, and salamanders that are able to live on land or in the water 9. animals with no backbone 10. a complete change in form, especially in some animals 13. to become larger and take up more space 14. inhale or exhale 15. to become suitable for an environment 16. animals whose body temperatures change with their environment 17. the ability to do work

Down 2. the things around something 4. when a liquid becomes a gas 6. the placing of plants or animals into groups according to their likenesses 8. animals who keep the same body temperature 10. between hot and cold 11. animals who have hair or fur, give birth, and make milk for their young 12. to stay alive