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OpenStudy (anonymous):
the circulatory system includes the a. lungs, heart, and brain b. lungs, blood vessels, and heart c. heart, blood, and blood vessels d. heart, arteries, and veins
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OpenStudy (anonymous):
@Tootles143
OpenStudy (anonymous):
What do you think it is?
OpenStudy (anonymous):
d
OpenStudy (anonymous):
I was thinking the same thing either that or B.
OpenStudy (anonymous):
ok thank you
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OpenStudy (anonymous):
yw. Anytime. :)
OpenStudy (anonymous):
Lungs are respiratory system so not a or b
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