Air movement to the mammalian respiratory surfaces can be reduced when smooth muscle in the walls
of the ____ contract(s).
a. epiglottis
b. bronchioles
c. large bronchi
d. trachea
e. aorta
B
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What is the most complex structure DNA can form?
A. individual nucleotides B. a folded and bended double helix C. a single strand of DNA D. a DNA double helix
Examples of isotopes include:a
oxygen 8 and oxygen 16. b. carbon 12 and nitrogen 14. c. hydrogen 1 and helium 1. d. sodium 23 and potassium 23. e. carbon 12 and carbon 14.
The most economically useful unicellular fungi are
A. basidiomycetes. B. mushrooms. C. actinomycetes. D. yeasts.
Ginkgo trees are known to lose their leaves at a certain time each year throughout the United States. Based on this information, Ginkgo trees in China must behave the same way. These statements are an example of:
A. inductive reasoning B. a theory C. an experiment D. deductive reasoning