Trace the path of an inhaled air molecule in a human being.
A. nasal cavity-pharynx-larynx-glottis-trachea-bronchi-bronchioles-alveoli
B. nasal cavity-pharynx-glottis-trachea-larynx-bronchi-bronchioles-alveoli
C. nasal cavity-pharynx-glottis-larynx-trachea-bronchi-bronchioles-alveoli
D. nasal cavity-pharynx-glottis-larynx-trachea-bronchioles-bronchi-alveoli
E. nasal cavity-glottis-larynx-trachea-pharynx-bronchi-bronchioles-alveoli
Answer: C
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How does a swim bladder help the ray-finned fishes maintain buoyancy?
A) It removes water from the digestive tract. B) It removes oxygen from the water and stores it. C) Gas is added to the bladder as the fish's depth increases. D) Gas is removed from the bladder as the fish's depth increases. E) It adds and removes salt from the water stored in the bladder, which changes its density and thus its buoyancy.
Compared to the first big syphilis epidemic several hundred years ago in Europe, the strains of Treponema pallidum that cause syphilis today
A. tend to be more virulent. B. tend to be less virulent. C. are about equally virulent. D. cannot be compared.
The detection of an enzyme called ________ in a cell is an indicator that the cell may be cancerous because it is rarely present in normal cells
Fill in the blank(s) with correct word
A host-parasite interaction between two species is one in which:
a) both species suffer negative consequences. b) one species is harmed, but the other benefits. c) both species benefit. d) one species is harmed, but the effect on the other is neutral