<span>Vitamin D is the only vitamin the body can produce naturally.
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Correct answer choice is :
<h2>A) Transportation regulations to prevent overcrowding </h2><h2 /><h2>Explanation:</h2><h2 />
Good personal hygiene is necessary for encouraging good health. Personal sanitation practices such as washing your hands and brushing and flossing your teeth will help keep bacteria, viruses, and illnesses at recess. And there are thinking as well as physical advantages.
Answer:
Vaccinations are not always effective.
Explanation:
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