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4th grade WYLIE Science Unit A_Ch_2

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
Created by: Wylie