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Question
The key ingredient in planetary formation in the solar nebula is ________.Answer
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Related questions
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How long ago did multicellular life forms appear in the fossil record?
A) 4.5 billion years ago
B) 3.8 billion years ago
C) one billion years ago
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Thanks to the far-flung Voyager and Pioneers, knowledge of our presence has now spread out over 30 light years.
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