A nutrient not required/has no function ...

A nutrient not required/has no function in plants except in Fabacease, but essential nutrient of animals whose deficiency makes a person anemic as it is an integral part of vitamin `B_(12)`, and this nutrient is

Iron

Calcium

Cobalt

Cadmium

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The correct Answer is:

Vitamin `B_(12)` is a dark red compound containing cobalt.

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