(C) The chlorophyll molecule consists of a porphyrin head and a phytol tail.The porphyrin head is a tetrapyrrole ring structure.At the center of this

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(C) The chlorophyll molecule consists of a porphyrin head and a phytol tail.The porphyrin head is a tetrapyrrole ring structure.At the center of this porphyrin ring,a single $Mg^{2+}$ (magnesium) ion is coordinated.This magnesium ion is essential for the light-harvesting function of chlorophyll.