Difficulty: Easy
Correct Answer: Frog
Explanation:
Given data
Concept / ApproachGroup the options by broad biological class.
ClassificationChicken and Swan → Birds (Aves).Snake and Crocodile → Reptiles (Reptilia).Frog → Amphibian (Amphibia).
DecisionOnly one option is an amphibian; the others form pairs within birds or reptiles.
Final AnswerFrog
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