Select the line of defense that displays immunologic memory.
A. First line defenses
B. Second line defenses
C. Third line defenses
D. Nonspecific line defenses
C. Third line defenses
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There are no direct-to-consumer genetic tests available that screen for breast cancer susceptibility
a. True b. False Indicate whether the statement is true or false
The gas tail of a comet
a. is smooth and featureless with a spectrum identical to that of the Sun. b. is present even when the comet is located in the region of the Kuiper belt. c. is unaffected by the magnetic field of the Sun. d. always points toward the Sun. e. is streaked and shows emission lines of ionized atoms.
Continued exposure to allergens may result in
a. inflammation of the lining of the respiratory tract due to production of histamine and cytokines. b. increased mucous secretion. c. constricting of the airways. d. sneezing. e. all of these
During their diastole, the heart chambers are contracting.
Answer the following statement true (T) or false (F)