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_______________, harmful or helpful, is considered to be the source for new alleles and a main contributor to the diversity of life on Earth.

User Mrtedweb
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Genetic mutation is considered to be the source for new alleles and a main contributor to the diversity of life on Earth.
User Mkrause
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The answer is "mutation".

Hope this helps!

-Payshence xoxo

User Yamenk
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