Hi Willingtolearn Body's is the possessive form when you refer to one body (singular). Bodies' is the possessive form when you refer to more than one body (plural). If your phrase refers to the 'human body' in general (and is therefore singular), for example, it would be correct to write it this way: ''The body's ability to repair and regenerate''
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Proper noun Jerry.
Would you say we have more Jerry's, Jerrys', or Jerries?