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>
Answer:
Yes it is, it reduces mess as well as improves the quality of the snack.
Explanation:
Less people will have to inhale the second smoke from others due to smoking in public. Many people could have less health problems due to lack of second hand smoke inhalation
