railway RRB Technician Grade 3 Mock Test 2024 General Science Biology Zoology

ಜೀವಸತ್ವ B12 ರಲ್ಲಿ ಯಾವ ಲೋಹದ ಅಯಾನುಗಳಿವೆ?

1

ಕಬ್ಬಿಣ

2

ಸತು

3

ಕೋಬಾಲ್ಟ್

4

ನಿಕಲ್

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