The Source of MOST of a Protostar's Heat Is

question 313

Multiple Choice

The source of MOST of a protostar's heat is

• A) gravitational energy released as the protostar expands.
• B) nuclear reactions in its core converting helium to carbon and oxygen.
• C) gravitational energy released as the star contracts.
• D) nuclear reactions in its core converting hydrogen into helium.

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Past Participle

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