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7
Science
6th Grade
01/10/2012

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Term
mollusk
Definition
an inveterate with a soft, body most are protected by a hard outer shell.
Term
open circulatory system
Definition
when blood is not always inside the blood vessels
Term
gills
Definition
organs that remove oxygen from the water
Term
mantle
Definition
a thin layer of tissue that covers a mollusks internal organ and produces the shell [in mollusks that have a shell
Term
radula
Definition
a fexible ribbon of tiny teeth used to eat
Term
arthropod
Definition
invertebrates that have an external skeleton, a segmented body and jointed appendages
Term
exoskeleton
Definition
waxy outer skeleton the protcts the animal
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