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What other characteristics might be present in an organism that moves in a certain direction,such as toward food?


A) cephalization with polarity of the body axis
B) radial symmetry with concentration of nerves
C) a mouth located on the midventral region away from the head
D) none of the above

E) A) and B)
F) A) and C)

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Extracellular fluids are divided into blood plasma,interstitial fluid,and ________________.

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What are the generalized development stages in metazoans (in order) ?


A) zygote,blastula,gastrula,complete gut formation
B) zygote,gastrula,blastula,complete gut formation
C) zygote,gut formation,gastrula,blastula
D) none of the above

E) B) and C)
F) All of the above

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The grouping of single cells into definite patterns or layers represents the level of organization called the ___________.

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