Dental 1st evidence of calcification of Primary Mandibular 1st molar is seen in A 14 wk IU B 16 wk IU C 17 wk IU D 15 ½ wk IU 💡 Explanation 1st evidence of calcification of Primary Mandibular 1st molar is seen in ✓ Correct Answer: D. 15 ½ wk IU