40. Circulatory System
Circulatory and Respiratory Anatomy
Multiple Choice
Multiple ChoiceAll known birds and mammals have __________.
A
a single circulatory system and a four-chambered heart
B
a double circulatory system and a three-chambered heart
C
a double circulatory system and a two-chambered heart
D
a single circulatory system and a two-chambered heart
E
a double circulatory system and a four-chambered heart
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