Which of the following naturally occurring substances limits the absorption of calcium and iron?

Question

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Oxalic acid, also known as oxalate, can limit the absorption of calcium and iron. It is found in certain vegetables like spinach, rhubarb, and beet greens. Avidin, found in egg whites, can limit the absorption of biotin. Solanine, found in potatoes and tomatoes, can have toxic effects in high amounts. Safrole, found in sassafras and certain spices, is a potential carcinogen.

Which of the Following Naturally Occurring Substances Limits the Absorption