railway RRB Group D Mock Test Series 2024-25 General Science Biology Zoology

मानवी शरीरातील सर्वात कठीण ऊती कोणती?

1
बाह्यत्वचा (एपिडर्मिस)
2
कंकाल स्नायू
3
दंतवल्क (टूथ एनामेल)
4
कास्थी 
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