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malry187 malry187
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Posts: 302
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5 years ago
The one-way flow of blood in veins is maintained by ________.
A) blood pressure
B) muscles pressing against the veins
C) their thick walls
D) valves
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wrote...
5 years ago
 D
malry187 Author
wrote...
5 years ago
This is very helpful, my teacher this year is not good
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