17(i) Mammals maintain their body temperature because
a. They have 4 chambered heart and no mixing of oxygenated and
deoxygenated blood occurs.
b. They have 3 chambered heart and no mixing of oxygenated and
deoxygenated blood occurs
c. They have 3 chambered heart and mixing of oxygenated and deoxygenated
blood occurs
d. They tolerate mixing of oxygenated and deoxygenated blood.
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