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12 Cards in this Set

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exoskeleton
a hard outer covering that supports and protects some animals without backbones
molt
to shed an animal's outer covering
backbone
the main bone, made up of many somall bones joined together, that runs along the middle of the back in some animals
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 backone 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