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WYLIE_Science_UA_2
4th grade WYLIE Science Unit A_Ch_2
Term | Definition |
---|---|
backbone | the main bone that runs along the middle of the back of some animals |
exoskeleton | a hard outer covering that supports and protects some animals without backbones |
molt | to shed an animal's outer covering |
gills | organs for breathing found in fish and amphibians |
amphibian | one of a large group of animals with backbones that live part of their lives in water and part on land |
reptile | an animal with a backbone that has a dry, scaly skin |
mammal | an animal with a backbone that usually has hair on its body and feeds milk to its young |
behavior | the way a living thing acts |
instinct | a behavior that an animal is born with and does not need to learn |
reflex | a simple automatic behavior |
stimulus | the cause of a behavior |
response | a behavior caused by a stimulus |