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

Question

( 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

Answer 1

(C) is the right answer.

Class – Mammalia : Heart is four- chambered. They are homoiothermous. Respiration is by lungs.