![Valves of veins prevent the backward flow of blood under ____.](https://www.gkseries.com/blog/wp-content/uploads/2022/04/Valves-of-veins-prevent-the-backward-flow-of-blood-under-____.png)
Q. Valves of veins prevent the backward flow of blood under ____.
A. low pressure
B. high pressure
C. normal pressure
D. very high pressure
Answer: low pressure
A. low pressure
B. high pressure
C. normal pressure
D. very high pressure
Answer: low pressure
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