Answer: Hypersensitivity reaction is a condition in which the normally protective immune system has a harmful effect on the body. It involves harmful immune response following sensitization and subsequent antigen contact. Type IV such as contact dermatitis reactions are delayed and cell-mediated and are the only hypersensitivity reaction that involves sensitized T lymphocytes rather than antibodies.
<span>Fetal alcohol syndrome can cause parts of the brain to be underdeveloped and can cause mental weaknesses.
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Type II error is called false negative, that mean that you say the null hypothesis is right when it is not. In this case, the null hypothesis is "the drug is not safe". Then the error should be <span>to conclude the drug is safe when in, fact, it is unsafe</span>.
Answer: your answer is A. The quality of air and water at places where people live,work, and go to school.
Explanation: environment is a where people live together.
