This swimming creature always looks like he is smiling.
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Fish
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Dolphin
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Crocodile
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None
B
Correct answer
Explanation
Dolphins have a permanently curved jawline that gives them a natural smiling appearance, which is why they are often described as always smiling. This is an anatomical feature, not an emotional expression. Fish (A) do not have this feature, and crocodiles (C) have quite different jaw structures.