Answer:
Taking vitamin D by mouth is effective for preventing and treating rickets. A specific form of vitamin D, called calcitriol, should be used in people with kidney failure.
Explanation:
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Sickle red blood cells can block the blood vessels in the lungs. This reduces oxygen flow to the lungs and can make it hard to breathe. This condition is an emergency and may be life-threatening.
Answer:
Fetuses receiving antibodies from their mothers across the placenta before birth
Explanation:
Passive immunity come from the introduction of antibodies from another person (ie a mother to her fetus)
