Narrator (V.O.): Excretion is the process by which living organisms remove harmful metabolic waste from their body. This helps to prevent the build-up of toxins, ensuring the organism stays healthy and functional.[Scene 2: The Human Excretory System] Cut to a diagram of the human excretory system: kidneys, ureters, bladder, and urethra.Narrator (V.O.): In humans, the excretory system is key for filtering the blood and removing waste products like urea and excess water. The main organs involved are the kidneys, ureters, bladder, and urethra.[Scene 3: The Nephron – The Functional Unit of the Kidney] Zoom into the kidney to show nephrons at work.Narrator (V.O.): Inside each kidney are millions of tiny units called nephrons. Nephrons filter blood, remove waste, and reabsorb vital substances, producing urine in the process. This helps maintain the body’s water and salt balance.[Scene 4: Excretion in Plants] Cut to visuals of plants, focusing on their leaves and roots.Narrator (V.O.): Now let’s look at how plants handle excretion. Unlike humans, plants don’t have specialized excretory organs. Instead, they release gases like oxygen and carbon dioxide through small openings in their leaves called stomata.Scene 5: Visual showing stomata opening and closing.Narrator (V.O.): Excess water is removed through a process called transpiration, and some waste products are stored in vacuoles or released when plants shed leaves or bark.