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4 Cards in this Set
- Front
- Back
arthropods
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bilaterally symmetrical animal with joined appendages a protective endoskeleton and segmented body
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cnidarians
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hollow - bodied animals w/2 cell layers that are organized into tissues.
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gills
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organs that allows a water welling animal to exchange carbon dioxide for dissolved oxygen in the water
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open / closed circulatory system
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a type of blood - circulation system that lack blood vessel and in which bold washes over the organ
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