Chapter 2: Animals

Front

bakcbone

Back

the main bone, made of many small bones joined together, that runs along the middle of the back of some animals

Front

exoskeleton

Back

a hard outer covering that supports and protects some animals without backbones

Front

molt

Back

to shed and animal's outer covering

Front

gills

Back

organs for breathing found in fish and amphibians

Front

amphibian

Back

one of a large group of animals with backbones that live part of their lives in water and part on land

Front

reptile

Back

and animals with a backbone that has a dry, scaly skin

Front

mammal

Back

an animal with a backbone that usually has hair on its body and feeds milk to its young

Front

behavior

Back

the way a living thing acts

Front

instinct

Back

a behavior that an animal is born with and does not need to learn

Front

reflex

Back

a simple, automatic behavior