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The correct choice highlights the essential functions of healthy kidneys in maintaining the body's homeostasis. Healthy kidneys perform crucial roles such as filtering blood, regulating electrolytes, and balancing fluids. One of their primary tasks is the excretion of metabolic waste products, which include urea and uric acid. Urea is a byproduct formed from the breakdown of proteins, while uric acid comes from the metabolism of purines found in various foods. Additionally, kidneys regulate water balance, ensuring that the body retains or excretes appropriate amounts based on hydration and other factors.

This choice accurately reflects the kidneys' role in waste removal and fluid regulation, which are vital for overall health. Understanding the kidneys’ filtration system is essential for appreciating how they help prevent toxic buildup of wastes and maintain a balanced internal environment. Other options do not align with kidney functions; for instance, the kidneys do not excrete carbon dioxide and proteins, nor do they store vitamins and minerals or produce digestive enzymes.