In the proton-proton cycle, you must first make deuterium, then helium.

Name: In the proton-proton cycle, you must first make deuterium, then helium.
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In the proton-proton cycle, two protons combine to form deuterium, which then undergoes further fusion to form helium. In the proton-proton cycle, two protons combine to form deuterium, and then deuterium combines with another proton to form helium.

In the Proton-Proton Cycle, You Must First Make Deuterium, Then