Final answer:
The lymphatic system of the human body functions as the cleaner, removing waste such as proteins, excess fluids, and bacteria. Other systems like the respiratory system remove waste gases, and the excretory system disposes of urine. Therefore correct option is D
Step-by-step explanation:
The system of the human body that acts like a maintenance worker, cleaning up the waste the body generates, is the lymphatic system. This system is an integral part of both the immune and circulatory systems. It helps maintain fluid levels in our body tissues by removing all forms of waste, such as proteins, excess fluids, and bacteria. The lymph nodes filter these substances out and make sure they are properly disposed of. The respiratory system also plays a role in expelling waste, as it is responsible for removing carbon dioxide, a waste gas, from the bloodstream. Similarly, the excretory system, specifically through the urinary tract, disposes of waste in the form of urine.