2. The main characteris of invertebrates is that they haven´t got a
spinal colum or an internal skeleton.
3. Invertebrates have got different body coverings:
Some invertebrates, like crabs and oysters,have got a
hard shell to protect themselves.
Other invertebrates, like ants and beetles, have got a
rigid covering called an exoskeleton.
Some invertebrates, like worms, have got a soft body
withouth protection.
4. Main grops of invertebrates.
Mollusk have got a hard shell.
Jellyfish and polyps have got long tentacles.
Sponges have got soft body with holes called
pores.
Echinoderms are covered with sarp spikes.
Arthropods have got exoskeleton and jointed
legs.
Annelids: They´ve got logn, soft body that is
divided into rings.
5. Arhtropods
Insects have got six legs.Three main parts head,
thorax and abdomen.
Arachnids have got eight legs.Two main parts
cephalothorax and abdomen.
Crustaceans have got ten legs.Two main parts
cephalothorax and abdomen.
Myriapods have got many legs and two main parts
the head and the trunk.
6. Mollusks
Bivalves:Hva got a shell with two parts called
valves.
Gastropods:Have got spiral shell.Other gastropos
haven´t got spiral shell.
Cephalopods:Have got a long arms to catch their
food.
