In which of the following classes of organic compounds must there be at least two oxygen atoms?
A) carboxylic esters
B) ketones
C) both a and b
D) neither a nor b
A
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A change a population's genetic makeup through successive generations is known as
A. emigration. B. mutation. C. natural selection. D. biological evolution. E. genetic drift.
The majority of air leaks in sheet metal duct systems occur?
The West Bank and Gaza Strip are called the "Occupied Territories" because they are
A) parts of Israel occupied by Palestinians. B) parts of Israel under attack by Palestinians. C) controlled by the British as part of the British Mandate. D) remnants of Palestine occupied by Israel. E) both parts of Israel occupied by Palestinians and under attack by Palestinians.
Which of the following factors applies to the Enhanced Fujita scale?
A. the size of the thunderstorm image on a radar screen B. the size of the tornado-producing thunderstorm C. the amount of hail that falls from a mature thunderstorm D. the strength of a tornado