Ages 6 through 17 years should do 60 minutes (1 hour) or more of moderate-to-vigorous physical activity daily.
The first successful heart transplant.
Answer: D. The conjuctiva.
Explanation:
The conjuctiva is a membrane that lines the inside of the eye. Its function is to lubricate the surface of the eye, preventing it from dryness.
In trachoma, the conjuctiva becomes dry, scarred and this prevents it from performing its function of lubricating the eye. Trachoma can be treated but if left untreated, it can lead to blindness.
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A.Closing of the values when blood leaves the heart
