After 5 billion years our sun will become a red giant. If the core tem – McqOptions

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1.	After 5 billion years our sun will become a red giant. If the core temperature of the red giant increases to 108 K again, energy can be produced through fusion once more by using ____________ to make carbon.
A.	lithium
B.	helium
C.	hydrogen
D.	protons
Answer» C. hydrogen

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