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9. (5 points) The seeds of a plant, moringa oleifera, act as a natural water coagulant. Circle the answer indicating the optimal moringa oleifera dose (in mg/L ) for coagulation based on the turbidity results in the plot shown directly to the right of this question (modified from Raju et al 2018). a. 100 b. 150 c. 200 d. 250 e. 300 f. 350