What is common between Psittacula, Ornithorhynchus and Macropus ?
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a
Dry and cornified skin
b
Pneumatic bones
c
Four-chambered heart
d
Oviparity
answer is C.
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Detailed Solution
Psittacula belongs to class Aves. Ornithorhynchus and Macropus belongs to class Mammalia. In both Aves and Mammalia 4 chambered heart is present. Oviparity is present in Ornithorhynchus. Oviparity is absent in Macropus. Pneumatic bones are present in class Aves. Dry and cornified skin is present in class Reptilia.