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Biology 20 Online
OpenStudy (anonymous):

Which of these animals has an open circulatory system? A. crayfish B. amoeba C. chicken D. mouse

OpenStudy (anonymous):

I know its not a damn chicken or a mouse

OpenStudy (petiteme):

this will help dear ^_^ http://www2.gsu.edu/~bioasx/closeopen.html

OpenStudy (anonymous):

A

OpenStudy (petiteme):

Good! :D

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