Approximately how long does it take for the human stomach to empty following a meal?
A. 4 hours
B. 1 hour
C. 2 hours
D. 12 hours
E. 24 hours
A
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In addition to investigations with bacteria that led to him being considered the Father of Microbiology, Pasteur also
A. found that some molecules can exist as stereoisomers. B. created aspartame. C. separated organic acids using a microscope. D. discovered polarized light. E. found that some molecules can exist as stereoisomers AND separated organic acids using a microscope.
In ____________________ membranes, layers secrete fluid that fills the space between the two surfaces. Fill in the blank(s) with the appropriate word(s)
Bacteria living in a freshwater stream that are moved to salty seawater would
A. now be in a hypotonic solution. B. gain water as a result of the move. C. shrivel as a result of the move. D. now be in a isotonic solution.
Which of the following will tend to produce adaptive changes in populations?
A) genetic drift B) gene flow C) natural selection D) the founder effect