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