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Class – Mammalia : 1. Heart is four- chambered. 2. Respiration is by lungs. 3. They are poikilothermous. Regarding 1,2 and 3:

( a ) 1 is incorrect but 2 and 3 are correct
( b ) 2 is incorrect but 1 and 3 are correct
( c ) 3 is incorrect; 1 and 2 are correct
( d ) 2 is correct but 1 and 3 are incorrect
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(C) is the right answer.

Class – Mammalia : Heart is four- chambered. They are homoiothermous. Respiration is by lungs.
answered Jan 6, 2014 by pady_1
 

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