backbone

the main bone of the back

in animals & humans

exoskeleton

the tough shell or covering

of insects & other animals

skeleton

the hard parts of an

animal's body that

protect & support the body 

vertebra

one of the small bones

that make up the backbone

the skeletons of some animals

 are on the outside

animals with exoskeletons

 do not have bones on the inside

the backbone passes down the back

of the animal's body to support the animal

amphibians

live part of its life on land

 & part in the water.

are cold blooded

reptiles

are cold blooded.

their bodies are covered with plates or scales.

mammals

drink their mothers' milk when they are babies

they have hair

they are warm blooded

body temperature is warm

& will stay warm

even if the surrounding

 air or water is cold.

your spinal cord is

inside your backbone