A) fishes and amphibians
B) Annelida and Arthropoda
C) Annelida and Mollusca
D) reptiles and mammals
Correct Answer: D
Solution :
Ornithorhynchus is a connecting link between reptiles and mammals. They bear hair and mammary glands (like-mammals), but also possess some of the reptilian characteristics such as egg laying, presence of cloaca and some skeletal similarities.
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