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answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence

elements make up everything, and they combine to make compounds.

the answer is c