Ms. B is a 40-year-old woman who is the CEO of a struggling company. Lately, she has been experiencing headaches that are so severe that she gets dizzy and nauseated, and she is unable to carry out her usual daily routines. She reports that they usually begin as a throbbing pain in the left temple and then seem to spread throughout her head. A diagnosis of migraine headache is made after several tests. Based on the patient history and signs and symptoms, discuss this type of headache and its physiological causes

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you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".