According to most scientists, when did the first hominids--direct human forbears that were fully separated from the apes--appear on Earth?
A) a few billion years ago
B) a few thousand years ago
C) about a billion years ago
D) a few million years ago
E) about 100 billion years ago
D
Physics & Space Science
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The experiments of what person first clearly demonstrated the wave nature of light?
A) Maxwell B) Galileo C) Newton D) Young E) Einstein
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The general formula R-X is that of
a. an amine. b. an alkyl halide. c. an alcohol. d. none of these
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At what temperature is the Celsius scale reading equal to twice the Fahrenheit scale reading?
a. -12.3°F b. -24.6°F c. -12.3°C d. -6.1°C e. -20°F
Physics & Space Science