What does the apostrophe at the end of a noun mean

For example Nomadic Mongolians used yaks’ milk to create hard, sundried wedges of Byaslag

It this some kind of plural noun or possessive noun?

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It’s the possessive form of the plural ‘yaks’. By the way, your question should read ‘What does the apostrophe at the end of a noun mean’?

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Thank you teacher

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yak’s milk — possessive singular ( the milk of one yak )
yaks’ milk — possessive plural ( the milk of more than one yak )

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