Read: 'All reptiles are cold-blooded. Some cold-blooded animals live in water. Therefore ...' Which conclusion is certainly valid?
Answer and explanation
Correct answer: C. Nothing definite can be concluded about whether reptiles live in water
- Step 1: The statements say reptiles belong to the group of cold-blooded animals, and some members of that larger group live in water.
- Step 2: Those water-living animals might be fish or others; the premises do not link them to reptiles.
Answer
Nothing definite can be concluded.
Why not the others: Each other conclusion assumes a link that the premises do not give.
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