Biology
Surgical procedure in which a small portion of sperm duct is removed and cut end ligated in male is called

Tube cotomy
Vascotomy
Neurotomy
Psycotomy

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Biology
Which of the following is true about veins?

Veins are more muscular than arteries
Veins have valves; arteries do not
Veins have a smaller diameter lumen than arteries
Veins carry blood away from the heart, while arteries carry blood to the heart

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