This blood vessel has valves. What is it?
a. an artery
b. a capillary
c. a cell membrane
d. a vein
Answer: d
This blood vessel has valves. What is it?
a. an artery
b. a capillary
c. a cell membrane
d. a vein
Answer: d
a. an artery
b. a capillary
c. a cell membrane
d. a vein
Answer: d
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