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echinoderms
sea stars
10
Biology
8th Grade
04/01/2012

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Term
echinoderms
Definition
radially symmetric invertabret animals with spiny skin and tube feet
Term
Penta-radially symmetry
Definition
body plan in which the body parts extend from the center along 5 spokes
Term
ossicles
Definition
calcium carbonate plate that are a part os the echinoderm skeleton
Term
water vasscular system
Definition
a network of h2o filled canals that allow moveent in an echinoderm
Term
madreporite
Definition
sieve like plate where water enters the water vasscular system
Term
stone canal
Definition
tube that connects the madreporite to the stone canal
Term
ring canal
Definition
part of the water vasscular system that circles the mouth
Term
radial canal
Definition
extends from the ring to the end of each arm and is attached to 100's of tube feet
Term
tube feet
Definition
small moveable extensions of the water vasscular system use for feeding,respiration,and excreation
Term
bipinnaria
Definition
a bilaterally symetrical larvae common to echinoderms
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