Answer :

(i) The cutting and biting teeth labelled as A are the incisors. They are the first teeth to develop in an infant. They are present in the front and are 8 in number.

(ii) The piercing and tearing teeth labelled as ‘B’ are the canines. They are 4 in number are present chiefly in the carnivorous animals.

(iii) The grinding and chewing teeth labelled as ‘C’ are the premolars. They are also 8 in number. They have a flat chewing surface.

(iv) The grinding teeth present only in adult labeled as ‘D’ are the molars. They are 12 in number and are present in adults.

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