A) birds only
B) birds and mammals
C) reptiles and birds
D) fishes, amphibians and reptiles
Correct Answer: D
Solution :
Sinus venosus is present in fish, amphibians and reptiles. It is an accessory chamber of heart. Syrinx is responsible for the sound production. It is present in birds only. Archaeopteryx is considered to be a connecting link between reptiles and birds. Four chambered heart is present in birds and mammals.
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