Answer
a. A macromineral is a mineral required in large amounts (100mg or more per day), they are the representative elements in period 3 and 4 ($Ca$,$P$,$K$,$Cl$,$S$,$Na$,$Mg$)
b. Sulfur is macromineral, component of insulin, vitamin B, proteins and theliver
c. 86g
Work Step by Step
a. you can find this answer on the second paragraph of the topic "Chemistry Link to Health" page 108
b. you can find this answer at page 109, table 4.4
c.you can find this answer at page 109, table 4.4
