D. having trouble relaxing
Answer:
Sport refers to any type of organized physical activity, e.g: soccer, rugby, football, basketball and athletics.
Recreation activities are walking, swimming, meditation, reading, playing games and dancing.
Explanation:
I majored in Health
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>
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Drug Enforcement Agency
