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staedtler staedtler
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The source of a protostar's heat is
A)   gravitational energy released as the protostar expands.
B)   nuclear reactions converting helium to carbon and oxygen in its core.
C)   gravitational energy released as the star contracts.
D)   nuclear reactions converting hydrogen into helium in its core.
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Discovering the Universe

Discovering the Universe


Edition: 7th
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papachulopapachulo
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staedtler Author
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7 years ago
I really appreciate your help!
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