The human voice is generated by air moving through the _____
a. pharynx
b. glottis
c. epiglottis
d. pleura
e. trachea
ANSWER: b
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The two-stage thymic selection process for selecting self-tolerant, antigen-reactive T cells results in
A) allelic exclusion. B) clonal deletion. C) complementarity-determining regions. D) somatic hypermutation.
High-fat, high-protein diets make the ________ work harder, increasing the risk of problems with this organ
a. pancreas b. liver c. kidneys d. intestines
All of the following statements about the brown algae are true except:a
this group includes the most complex algae that have blades, stipes, and holdfasts. b. they share a common ancestor with representatives of the plant kingdom. c. they represent the largest members of the algae called seaweeds. d. they are harvested for algin, which is used in a variety of commercial products. e. they are ecologically important as producers and in providing habitats along rocky coastlines.
Which of the following is a vascular plant?
a. moss b. fern c. liverwort d. hornwort e. charophyte