Which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia?

Water is a major component of sweat but is not a waste product resulting from protein metabolism. Instead, it primarily serves to regulate body temperature through evaporation. While water is lost through sweating, it does not specifically relate to the breakdown of proteins or the formation of ammonia.

Lysozymes are enzymes found in various bodily fluids, including sweat, but they are not waste products of protein breakdown. Their primary function is to help protect against bacterial infections by breaking down bacterial cell walls. Thus, they do not play a role in the excretion process related to ammonia and protein metabolism.

Sebum is an oily substance produced by sebaceous glands and is involved in skin lubrication and protection. It is not related to the excretion of waste products from protein metabolism or ammonia. Sebum's composition and function are distinct from those of urea and do not involve the breakdown of proteins.