Both groups seemed equally eager to participate in the tasks, but the urban mice were better at solving the novel ones. They had a 77% success rate compared to the rural mice's 52%.
Could you tell me why 's is used?
It's a possessive: "rural mice's 52%" means "52% (success rate) of the rural mice".
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It's a possessive: "rural mice's 52%" means "52% (success rate) of the rural mice".
And the rural mice all got eaten by the farm cats in under a minute in a follow-up experiment.