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?

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