A) Cyclostomata
B) Aves
C) Reptilia
D) Mammalia
Correct Answer: B
Solution :
Characteristic features ofAves (i)Fore limbs are modified into wings for flight are two unique characters of birds (ii) Bones porous with air-filled spaces (pneumatic) and, hence, light but strong; many fused to provide rigidity, (iii) Heart 4-chambered; only right systematic arch persists in adult; renal portal system reduced; red blood corpuscles nucleated.
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