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the claim

Sharks are mammals.

the verdict
REFUTED
the evidence says no
Recorded sources
1 source for · 2 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that sharks are mammals?

No. A reference book states plainly that sharks are fish, not mammals, and a logic textbook treats 'sharks are mammals' as a false proposition. One worksheet lists the sentence only as an exercise item, not as a factual assertion.

Verdict: REFUTED · 1 source for, 2 against · Last checked

Evidence for · 1
Science investigations, grades 6-8 : inventive exercises to sharpen skills and raise achievement
2003
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Imogene, F. (2003). Science investigations, grades 6-8 : inventive exercises to sharpen skills and raise achievement. archive.org. https://archive.org/details/scienceinvestiga0000fort

Evidence against · 2
Just Curious About Animals and Nature, Jeeves
2010
Get citation
Barrett, E. & Mingo, J. (2010). Just Curious About Animals and Nature, Jeeves. play.google.com. https://play.google.com/store/books/details?id=bEPy14tcN7EC&source=gbs_api

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More against · 1
Formal logic : its scope and limits
1990
Get citation
C, J. R. (1990). Formal logic : its scope and limits. archive.org. https://archive.org/details/formallogicitssc0000jeff_x4g0

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