Which conclusion follows from: "No reptile is warm blooded. All snakes are reptiles."?
Correct answer: B. No snake is warm blooded
- 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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About Critical Thinking
Critical thinking examines how conclusions follow from evidence, including claims, assumptions, arguments, inferences and relevant facts. Questions ask you to identify hidden assumptions, distinguish strong from weak evidence, assess cause and effect, recognise common reasoning errors, and decide which statement strengthens or weakens an argument.
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