A) Archaeopteryx is connecting link between aves and mammals
B) Duck-billed platypus is connecting link between mammals and reptiles
C) Sea horse is connecting link between horse and fish
D) Hydra is connecting link between protozoa and metazoan
Correct Answer: B
Solution :
Duck bill platypus is a connecting link between mammals and reptiles because it possesses a mixture of characters of both mammals and reptiles.
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