Since 1980, the proportion of adults in the United States who are obese has ____
a. decreased by half
b. doubled
c. tripled
d. decreased dramatically
e. stayed the same
ANSWER: b
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Most xylem vessels in angiosperms consist of stacked vessel elements, water flows vertically through ____ and laterally through ____
a. phloem; xylem b. vessel elements; tracheids c. tracheids; vessel elements d. perforation plates; pits e. pits; plasmodesmata
Seasonal fluctuations in atmospheric carbon dioxide concentrations are greater in the Northern Hemisphere than in the Southern Hemisphere
Indicate whether the statement is true or false
Special structure found in seeds that are dispersed by ants is called:a
glyoxisomes. b. elaiosomes. c. peroxisome. d. elatoir. e. lysosome
Aseptic means
A) sterile. B) free of all microbes. C) clean. D) sanitized. E) free of pathogens.