Half of the antibiotic prescriptions given to humans in the U.S. are unnecessary or the wrong ones.
Answer the following statement true (T) or false (F)
True
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Which property of waves has been most important in allowing seismologists to identify the boundaries of the inner core/outer core and the outer core/mantle?
A) wave reflection B) wave amplitude C) wave velocity D) wave refraction
Over three-fourths of the world's fresh water is held in the form of ________
A) soil moisture B) underground water C) atmospheric water D) glaciers E) ice bergs
The Older Dryas and Younger Dryas stages represented ________.
A. two cooling stages during warm-up from the last major glacial advance B. periods of dry climate in the last 20,000 years C. two of the more abrupt warming stages during the last glaciation D. one warming stage and one cooling stage during the last glaciation
Cobalt-60 is a radioactive isotope sometimes used in the treatment of cancer. Which of the following statements is true about an atom of cobalt-60?
A) It contains 27 neutrons. B) It contains 27 protons. C) It contains 60 neutrons. D) It contains 60 protons.