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What is the name for the portion of a star's life cycle when it is using hydrogen for fuel? A. red giant B. protostar C. white dwarf D. main sequence
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What is the name for the portion of a star's life cycle when it is using hydrogen for fuel? A. red giant B. protostar C. white dwarf D. main sequence

User Lars Westergren
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it A i hope it helps
User EugeneMi
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For the majority of a star's life, it is burning hydrogen fuel. During this time it is said to be in the main sequence.
User Hury Shen
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