ZoologyWhich one of the following animals is a connecting link between reptiles and mammals?

Which one of the following animals is a connecting link between reptiles and mammals?

  1. A

    Platypus

  2. B

    Archaeopteryx

  3. C

    Dolphin

  4. D

    Kangaroo

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    Solution:

    Prototherians, e.g., duck-billed platypus (Ornithorhynchus), are considered connecting links between reptiles and mammals as they exhibit both reptilian and mammalian characters. 

    Mammalian characters:

    • Mammary glands
    • Hair
    • Diaphragm

    Reptilian characters:

    • Cloaca
    • Well-developed  coracoid in pectoral girdle 
    • Oviparity
    • Eggs with yolk and shell.
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