Which of the following have been associated with prolonged treatment with drugs such as Premarin or Provera?
A) an increased risk of breast cancer
B) an increased risk of heart problems
C) both a and b
D) neither a nor b
B
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The Maunder minimum during the Little Ice Age has been linked to
A) volcanic activity and multiyear changes in global circulation. B) changes in Earth's axial tilt (obliquity). C) changes in Earth's orbital shape (eccentricity). D) a period of low sunspot activity from 1645 to 1715. E) a cooling of the Gulf Stream from rapid glacial melt in Greenland.
Why is sensible heat detectable while heat that is not sensible cannot be measured?
a. A thermometer can measure the decrease in temperature but not heat capacity. b. The latent heat of fusion cannot be calculated. c. Heat that is not sensible and heat that is sensible can both be measured. d. A thermometer measures the decrease in temperature, but as liquid changes to solid, the loss of heat is not measurable.
How many covalent bonds would the following generic atom usually form?
A. 8 B. 2 C. 4 D. 1 E. would usually not form any covalent bonds
Which of the following is not characteristic of desert plants?
a. widespread, shallow root systems b. deep root systems c. large leaves that droop in the bright sunlight d. succulent leaves or stems e. becoming dormant during dry periods