Roughly how many different chemical compounds are there?
A) 20
B) 100
C) 4
D) 500
E) many more than 500
E
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Even if societies on stars in distant galaxies survive at a technological level for only 10 years, that is long enough to establish two-way communication with them
Indicate whether the statement is true or false
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The near point of a farsighted person's uncorrected eyes is 80 cm. What power contact lens should be used to move the near point to 25 cm from this person's eyes?
A) 2.8 diopters B) -2.8 diopters C) -4.0 diopters D) -4.2 diopters E) 4.2 diopters