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Ca²⁺ ions are necessary for
I) Blood clotting
II) Maintaining regular heartbeat
III) Muscle contraction
IV) Photosynthesis in plants

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I, II, III & IV

I, II & III

I, II & IV

I, III & IV

answer is B.

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The main pigment for the absorption of light in plants is chlorophyll which contains magnesium.

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