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Q.
Identify X in the following cladogram
Animal Kingdom
Solution:
Amniotic egg is produced by reptiles, aves (birds) as well as prototherian mammals. So 'X' can be identified as amniotic egg
Aves and mammals have dicondylic skull while reptiles have diapsid skull. Reptiles have three chambered heart while aves and mammals have four
chambered heart. All of them are tetrapods, hence do not show bipedal locomotion
