The second statement best explains the type of blood vessel and the function of these vessels' valves - <span>These are veins, which prevent the backflow of blood because the walls have little muscle to pump blood back to the heart.
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Veins are large blood vessels which carry blood back to the heart. <span>Veins have a system of valves to prevent back-flow.</span>
Antisocial behavior, risk taking behavior, impassivity and aggression
Answer: B is the answer.
Explanation: Disinfecting a surface is cleaning off dirt and germs. When you use soap and water to remove dirt, your disinfecting it the surface, meaning your cleaning off the germs so you and your family or peers don't get sick.
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