Steepest cusp is seen in________?

A child has 12 permanent and 12 decidous teeth, what is his age________?

Calcification of roots of decidous teeth is completed by________?

The key to occlusion is________?

The interdental papilla is located in the________?

While charting the dentition of a child, the pedodontist finds that the following teeth are present in all the four quadrants; permanent central incisor, permanent lateral incisor, decidous cuspid, decidous first molar, decidous 2nd molar and permanent 1st molar. The eruptive pattern may be considered most nearly normal for a child aged________?