The primary function of external gills in aquatic animals is to
A. relay nerve impulses.
B. exchange gases with the water.
C. secrete reproductive hormones.
D. defend against invading microorganisms.
E. transport blood.
B. exchange gases with the water.
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Which of the following occurs during suction feeding in fishes?
A. Prey is trapped in the mouth and broken up by pharyngeal jaws in the pharynx. B. Prey is trapped in mucus on the gills and swept into the gut by cilia. C. Prey is captured in blades of baleen and then transferred to the gut. D. Prey is scraped off of rocks with grazing teeth. E. All of the answer options are correct.
In relation to malaria and P. falciparum, the human liver and circulatory system (especially red blood cells) are both locations that:
A. have immune system cells that express the PfEMP1 T cell receptors. B. contain P. falciparum during some stage of its life cycle. C. have immune system cells that can effectively keep up with P. falciparum's antigenic variation. D. demonstrate granulomas in response to P. falciparum infection.
____________________ result from immunological hypersensitivity to what should be harmless substances
Fill in the blank(s) with correct word
To support the world population at the same standard of living as we have in the United States would require ________ times the resources that are available on Earth today
A) 2 B) 1.5 C) 20 D) 5 E) 10