Mutations

4 clues
Sports of sorts
Darwinian phenomena
Evolutionary shifts
Biological variations.
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Abbreviations
Aberrations
Abolitions
Abstentions
Accusations
Actions
Activations
Addictions
Additions
Adjurations
Adoptions
Africannations
Agedirections
Ageexpectations
Agitations
Aidstations
Alienabductions
Alimentations
Allegations
Allocations