Support Reptiles are air-breathing vertebrates with completely ossified skeletons; so Conclusion alligators must be air-breathing vertebrates with completely ossified skeletons.
The stimulus starts with a general claim: reptiles are air-breathing vertebrates with completely ossified skeletons. From this premise, it concludes that alligators must therefore be air-breathing vertebrates with completely ossified skeletons.
Let's break down the structure of this argument. The premise is a definition, telling us that all reptiles fulfill certain criteria: being air-breathing vertebrates with ossified skeletons. Let's call all those characteristics together "X":
reptile → X
The second statement concludes that alligators must be X:
alligator → X
For this to be a valid conclusion, the argument must assume that all alligators are reptiles:
alligator → reptile
In other words, the structure we want will likely look something like this:
A → C (all A have some trait C)
Therefore, B → C
The key to the logic here will be the unstated assumption that B is a subgroup or subcategory of A: in other words, that all B are A (B → A).
Analysis by ArdaschirArguelles
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