Statement A: Mammals have diphyodont pattern of teeth eruption.
Statement B: In mammals two sets of teeth ( milk & permanent teeth sets) arise during lifetime.
Both statements are correct and statement B is correct explanation for statement A.
Both statements are correct and statement B is not a correct explanation for statement A.
Statement A is correct and statement B is incorrect.
Statement A is incorrect and statement B is correct.
In mammals two sets of teeth (milk & permanent teeth sets) arise during life time hence called diphyodont pattern of teeth eruption.
Primary ( deciduous ) or milk teeth is set of 20 teeth and permanent teeth is set of 28 - 32 teeth.
Mice have Monophyodont pattern while fish and reptiles have polyphyodont pattern of teeth eruption.
Hence option A is correct.