An X-ray of a 4-year-old child shows no signs of calcification in the mandibular second premolar. What does this suggest?

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It is premature to draw a definite conclusionThe tooth might form at a later stageThe primary second molar was removed to enable forward movement of the first permanent molarThe child may lack premolars permanentlyThe tooth has already erupted

Explanation

At the age of 4, absence of calcification in the mandibular second premolar indicates that the tooth may still develop later. It is not necessarily a sign of permanent absence or extraction effects.