grammaticality - "Change their positions" vs. "change their position"





“Those who qualify will be awarded a certificate” or “those who qualify will be awarded certificates”?
“On their back” or “on their backs”?



Should the singular or plural of position should be used in the following sentences?




  • Why Political Parties Change Their Positions: Environmental...

  • Do the stars change their position through the course of the night?

  • Why do stars appear to change their positions through the year?

  • Why do shadows change their position during the day?



The sentences are from the first page of the Google search for should not change their position.




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