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a
Birds and reptiles
b
Birds and mammals
c
Reptiles and mammals
d
Amphibians and mammals
answer is C.
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Detailed Solution
Duck-billed platypus is a connecting link between reptiles and mammals. It shows mammalian characters like mammary glands, hair, diaphragm etc., and It shows reptilian characters in having a large coracoid in pectoral girdle and in laying eggs with yolk and shell.