A. digestive and circulatory systems
B. reproductive and excretory tracts
C. nervous system and respiratory tract
D. air-sac and the comb
E. comb and the legs
Correct Answer:
Option C – nervous system and respiratory tract
A. digestive and circulatory systems
B. reproductive and excretory tracts
C. nervous system and respiratory tract
D. air-sac and the comb
E. comb and the legs
Correct Answer:
Option C – nervous system and respiratory tract
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