Concept:Excretory products are waste substances produced inside the body and removed from it.Explanation:Animals produce carbon dioxide and urea as metabolic wastes.Sweat is also an excretory product because it removes excess salts and water.Oxygen is not a waste product; it is taken in by animals for respiration.Animals release carbon dioxide, not oxygen, as a respiratory waste.Therefore, oxygen is the substance that is NOT an excretory product.Answer:D. oxygen