Classifying Living Things

4. These aquatic vertebrates are ________ with the exception of Tuna family and the Mackerel shark family.
5. and land Amphibians live in ______ and on ______.
7. Fish use _____ to breath underwater
8. Their ______ depends on the temperature of their environment
10. and salamanders use _____ to keep their skin moist for survival.
12. Mammals use the most complex forms of _____ to relate to one another.
14. These flying mammals have _______ skeletons, accommodating their need to stay light while flying
16. Birds lay ____ in an attempt to have offspring.
18. Rivulus This fish can live on land for a short period of time.
19. Reptiles regularly _____the outer layer of their skin.
20. Birds use their ____ for eating and for preening, manipulating objects, killing prey, fighting, probing for food, courtship and feeding young.

1. Amphibians change and go through _________.
2. Reptiles are _______ vertebrates.
3. Birds have ________ to keep them warm and to help with their ability to fly.
4. Amphibians are ________ and use their environment to control their body temperature.
6. Fish are classified as ___ ___.
9. Reptiles are covered in special _____ made up of scales, bony plates or combination of both.
11. Most Fish live only in_____
13. Mammals produce _____ to feed their young.
15. Mammals have some form of ____ to protect their skin and keep them warm.
17. _____ mammals give live birth.