Which one of the following is an exclusive character of class mammalia [BHU 2000; RPMT 2002]
A) Presence of a completely 4-chambered heart
B) Homoiothermy
C) Presence of muscular diaphragm
D) Internal fertilization
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A) Presence of a completely 4-chambered heart
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hiii,
the answer is option A
hope helps
the answer is option A
hope helps
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