Vocabulary 2

Vertebrates: Animal with back bones.










Invertebrates : Amimals withoutback bones.

Symmetry:is the balanced arragement of body parts around a center point or along a center line.

Sponge : Simple invertebrates with spores ,

Pore : A small opening  in a sponge throught wich water enters.

 Stinging-cells animal : Amimals with stinging-cell hollow sacklie body that lack organs.

tentacle : Armlike part of stinging-cell..

Flatworm : The simplest worm that have flat body .

tape worm:a kind of flatworm that have a ribbonlikebody divided into sections.

Cyst : a young worm with a protective covering.

Planarian : is  a common fresh water flatwaorm that is not a parasite

hookworm : is a roundworm that is a parasite .

anus: is an opening throught undigested food lives the body.

segmented worms : are wors with bode divided into sections.

Soft-bodied animals : animals with a protective coveriong