$A-$ The permanent teeth begin to replace the temporary ones at about the age of six years.
$R-$ This type of dentition is called diphyodont.

  • A
    $A$ and $R$ are correct.
  • B
    $A$ and $R$ are incorrect.
  • C
    $A$ is correct,$R$ is incorrect.
  • D
    $A$ is incorrect,$R$ is correct.

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