Classify- to arrange in groups by features that are alike.

Vertebrae -the small bones that are linked together to make a backbone.

Vertebrate - an animal with a backbone.

Invertebrate - an animal without a backbone.

Sponge - an invertebrate with a simple body that contains many small             holes.

Pores - the small holes in the body of a sponge.

Tentacle - a long, armlike part of an animal with stinging cells.

Stinging Cells - a special structure used to help capture food. 

Planarian - a common flatworm found in fresh water.

Organ - a body part that does a certain job.

Regenerate - to regrow.

Parasite - an  animal or palnt that depends on and harms another plant or             animal.

Host - an animal or plant on which a parasite depends.

Roundworm - a worm that has a lng tube-shaped body with a digestive             system.

Segmented worm - a worm whoses body is divided into segments or             sections.

Bristles - a stiff, strong hair used for moving.

Echinoderm - a spiny-skinned invertebrate that lives in the ocean.

Tube foot - a hollow structure with a sucker at the end.

Mollusk - an invertebrate with a soft body.  Some have 2 outer shells. some live in 1 piece shell others have no shells.

Arthropod - an invertebrate that has a segmented body and jointed legs.

Exoskeleton - the hard outer covering that is like a skeleton on the outside         of  the animal’s body.

Millipede - thousand  (1,000) legs

Centipede - hundred (100) legs

Crustaceans - Shrimps, lobsters and crayfish that live in water, have 2             main body parts and 5 pair of legs.

Abdomen - the rear part of an insect’s body

Thorax - the middle part of an insect’s body

Antennae - two feelers that help the insect smell and feel.  Sometimes they             are used for tasting and hearing.

 Molt - shed the outer covering Idea