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>
Cold can be caused by cold weather out side and the flu u can get from other people that are sick or bad living enviroments or rotton food
The correct answer is B. Bachelors degree, however if you are looking to be advanced, a masters degree is recommended.
Answer:B
Explanation:catching it early on will help.the earlier one discovers the better.
