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Biology, 10.07.2019 14:30 KillerSteamcar
Which lists three living units of the human body in order from the simplest to the most complex level of organization? red blood cell → circulatory system → blood nervous system → nerves → brain red blood cell → heart tissue → circulatory system bone tissue → skeletal system → bone
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Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine
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