invertebrates

Invertebrates is the group of animals that not have spinal column, and skeleton.
Invertebrates is divided in 6 groups: arthropods, molluscs, worms, echinoderms,sponges
and cnidarians.
Arthopods are divided in: insects, arachnids, crustaceans and myriapods.
Their body is divided in three main parts:  head, thorax and abdomen.
Molluscs are divided into gastropods bivales and cephalopods.
Molluscs do not have y legs.To move to one place to another,they use  a muscular foot.
Wormsdo not have legs, their bodies are long and soft.they are not protected by exoskeletons or shells.Their body divided into rings.
Echinoderms have a definite shape  whith hardsplates under their skin.Their can move from one place to another on hundres of small feet.
Cnidarians they live mostlyin the sea and have tentacles.
Sponges live in the water. There are a lot  of holes, called pores,in their body.