A) Balaenoptera
B) Delphinus
C) Pteropus
D) Ornithorhynchus
Correct Answer: D
Solution :
Ornithorynchus (duckbill platypus) is oviparous mammal wilth a cloaca. Platypus and Echidna belong to class?Prototheria. Balaenoptera is zoological name of blue whales. Delphinus is to dolphin and Pteropus is flying fox (bat). All of three are viviparous.
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