The plural possessive is masses'.
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The plural possessive form of "light" is "lights'".
The plural form is... 'officers in charge'.
The plural possessive form of "wave" is "waves'".
The noun quantum is a singularnoun. The plural form is quanta.A possessive noun requires the use of an apostrophe.The singular possessive form is quantum's. The plural possessive form is quanta's.
The possessive form for the plural noun charges is charges'.Examples:The charges' total exceeded my ability to pay.She always took care with her charges' appearance and behavior.