Most digestion in humans occurs in the first 25 centimeters of the 6-meter length of the small intestine called the _________________.
A. cecum
B. duodenum
C. jejunum
D. colon
E. omasum
B. duodenum
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Analysis of the nucleotide sequences of genes coding for phytochrome pigments suggest that the ancestors of
angiosperms were adapted for survival in ____.
a. freshwater aquatic environments b. sunny, xeric habitats c. shady forests d. habitats with very cold winters e. coastal marine waters
Which of the following is a flaplike structure
that helps prevent food from entering the windpipe?
a. uvula b. pharynx c. larynx d. epiglottis e. esophagus
Which of the following is NOT a form of active
transport? a. sodium-potassium pump b. endocytosis c. exocytosis d. osmosis e. none of these
Based on industrialization, which region of the United States is most affected by acid rain?
a. northwest b. southwest c. northeast d. southeast e. central plains