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

Biology & Microbiology

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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

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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

Biology & Microbiology

Special structure found in seeds that are dispersed by ants is called:a

glyoxisomes. b. elaiosomes. c. peroxisome. d. elatoir. e. lysosome

Biology & Microbiology

Aseptic means

A) sterile. B) free of all microbes. C) clean. D) sanitized. E) free of pathogens.

Biology & Microbiology