The quote employs a rhetorical question to highlight the harsh conditions faced by animals.
Rhetorical question is the rhetorical device used in the quote. A rhetorical question is asked not to elicit an answer but to make a point or prompt critical thinking. In the provided text, the question about whether the misery and slavery in an animal's life are just part of nature's order is used to emphasize the perceived harsh reality faced by animals.
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