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Write any one function of the following minerals:
a. Calcium
i. Calcium is a constituent of bones and teeth . It also aids in the of blood, healthy functioning of nerves, and controls muscle contractions.
b. Sodium
i. Sodium maintains and is involved in neurotransmission.
c. Iron
i. Iron is an important component of , and is involved in blood production, and brain development.
d. Iodine
i. Iodine is useful in the synthesis of hormone.
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