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Once it was realized that the pulse period tells us the rotation rate of the pulsar, why did astronomers know that these could not be normal stars?
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The mantle is made up of which structural zones?
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What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.
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Once it was realized that the pulse period tells us the rotation rate of the pulsar, why did astrono...
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