“Every living being has a body” is universal. Since the first premise places humans among living beings, the universal predicate applies to humans. Replacing “every” with “some” would not justify the same conclusion, because we would not know whether humans fall within the selected subset. Logical scope matters.
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Why the second premise matters
Ḥujjah: Deriving a Conclusion from Known Judgments
“Every living being has a body” is universal. Since the first premise places humans among living beings, the universal predicate applies to humans. Replacing “every” with “some” would not justify the same conclusion, because we would not know whether humans fall within the selected subset. Logical scope matters.