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SOVA2 [1]
3 years ago
9

????? can someone help pls lol

Biology
2 answers:
Shkiper50 [21]3 years ago
8 0

Answer:

b

Explanation:

Mademuasel [1]3 years ago
3 0
D
Explanation: the blood vessel showed above has valves. Veins are the only ones that have valves.These valves prevent backflow of blood to the leg.
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