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Class – Osteichthyes : 1. Air bladder is present 2. Air bladder regulates buoyancy (if present in any aquatic organism). 3. Heart is two- chambered 4. Heart has one auricle and one ventricle. Regarding 1,2,3 and 4:

( a ) 2 is incorrect; 1,3 and 4 are correct
( b ) All are correct
( c ) 4 is incorrect; 1,2 and 3 are correct
( d ) 1 and 4 are incorrect but 2 and 3 are correct
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(B) is the right answer.

Class – Osteichthyes : Air bladder is present which regulates buoyancy. Heart is two- chambered (one auricle and one ventricle).
answered Jan 6, 2014 by pady_1

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