A. possession of a calcacareous exoskeleton
B. body divided into an anterior prosoma and a posterior opisthosoma
C. blood system is involved in the circulation of respiratory gases
D. nervous system with separate ganglia along the length of the body
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A. provides a vehicle for increasing reproductive products in the body
B. often acts as hydrostatic skeleton
C. gives more surface area for diffusion
D. provides more room for organ development
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A. ectoderm
B. mesoderm
C. ectoderm
D. meriderm
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A. Cypraea moneta
B. Achatina fuloca
C. Hapalocwaena
D. Eugladina rosea
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A. possession of gills
B. possession of a cephalothorax enclosed in a carapase
C. eggs are usually carried by females
D. possession of four pairs of head appendages
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A. chelcerala
B. uniramie
C. trilobitomorpha
D. crustaecea
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A. caecum
B. aorta
C. anus
D. mouth
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A. gill
B. mantle cavity
C. nephridiopore
D. captaculum
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A. fluid
B. blood
C. water
D. acid
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