What do the processes of first, second and third dredge-up do with a

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What do the processes of first, second and third dredge-up do with a star other than just change its spectrum?
 
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Dredge-ups allow for more efficient chemical enrichment of the interstellar medium, which was probably an important factor in metallizing the early universe.
 


But it doesn't do anything special to the star it self in terms of lifetime or structure?
 

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