The function of the epiglottis is ____ while swallowing
a. to move the tongue out of the way
b. to cover the esophagus
c. to cover the glottis
d. to cover both the esophagus and the glottis
e. to secrete mucus
C
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Evolution acts at the level of the
A. ecosystem. B. population. C. species. D. community.
In which form are electrons transferred during typical redox reactions such as the oxidation of glucose?
A. as free electrons B. as hydrogen atoms C. as oxygen atoms D. as carbon atoms E. as phosphate groups
Which of the following is NOT a way that bacteria benefit humans?
A. produce foodstuffs such as cheese B. produce antibiotics C. break down substances harmful to humans, such as wastes, toxins, explosives, and petrochemicals D. kill harmful insects E. transfer nutrients across intestinal membranes
C14 is a radioactive isotope, and due to its predictable
__________ rate it is used to date organic fossils. Fill in the blank(s) with the appropriate word(s).