Explain evolutionary relationship among animal groups, Biology

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Evolutionary relationship among various animal groups is depicted in the cladogram given below. P, Q and R respectively shown:

a. Vertebrae, hair and four limbs.

b. Bony skeleton, hair and amniotic eggs.

c. Vertebrae, amniotic eggs and hair.

d. Respiration by skin, lungs and poikilothermy.

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