railway RRB Technician Grade 3 Mock Test 2024 General Science Biology Human body

মানুষের মেরুদণ্ডের স্নায়ুর সংখ্যা কয়টি?

1

33 জোড়া

2

31 জোড়া

3

32 জোড়া

4

36 জোড়া

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