Which conclusion follows from: "No reptile is warm blooded. All snakes are reptiles."?
- A. Some snakes are warm blooded
- B. No snake is warm blooded
- C. All warm blooded animals are snakes
- D. Some reptiles are snakes only
Explanation
Snakes fall entirely within reptiles, and reptiles are entirely excluded from the warm blooded category, so snakes are excluded too. This is a valid syllogism of the form no A is B, all C are A, therefore no C is B. Drawing the two circles on paper makes the exclusion obvious.
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