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Home Q & A Board Biology-Related Homework Help Zoology and Botany (Moderator: ehd123)
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Jermain_ Jermain_
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10 years ago

 
How do veins prevent the backflow of blood?   
A)
 
gravity   
B)
 
pressure   
C)
 
valves   
D)
 
bulk flow   
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padrepadre
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10 years ago
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Jermain_ Author
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#2
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10 years ago
Thank you very much.
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