Which cell type works to prevent our immune system from attacking self and from over-reacting to nonthreatening substances, is abundant in tissues next to body openings, and phagocytizes a broad range of antigens?

A) macrophages
B) natural killer cells
C) lymphocytes
D) monocytes
E) dendritic cells


Answer: E

Biology & Microbiology

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A clownfish may lure fish towards a sea anemone and get scraps of food in return. What kind of symbiotic relationship does this demonstrate?

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A 5% urea solution is hypotonic to a 10% urea solution.

a. true b. false

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The “lub” heart sound is produced by closure of the ____________________ valves. Fill in the blank(s) with the appropriate word(s)

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