fact about body system

circulatory

• it job is to move blood throught the body
• sponge and cnidariansit job is to move blood throught the body. sponge and cnidarians don't have a circulatory system.
• Insects and other vertebates have open circulatory system

Respiratory

• it job is to bring oxygen to the blood and removes the waste gas carbon dioxide.
• most invertedrate don't have specialized respiratory system at all
• adult amphibians breathe through both skin and lungs

excretory system

• many frogs and lizards use sticky tongue to catch insect
• bird use their beaks to eat food.
• lobsters and crabs have claws too

digestive

• it job is to break down food
• works with circulatory system
• other simple invertebrate like flatworm have digestive system with one openin

muscular

• a snake uses its muscles to slither along
• muscles in an straight erthworm
• bird have powerful muscles in their chest some use theme to fly ate incredeble speeds

skeletal

• The skeletal system supports the body and protects body organs.
• it work with muscular system
• minerals make bones hard

nervous

• a nervous system is made of nerve cells joined to form nerve.
• simple animals have simple nervous system.
• vertebrate have most complex nervous system.

bonis fact

• in vertebrates muscles produce movement by shortening and pulling on bones.

the end