Which of the following is considered a waste media?

Urine is considered a waste media because it is primarily composed of byproducts that the body needs to eliminate to maintain homeostasis. As the kidneys filter blood, they remove excess substances, such as urea, creatinine, and electrolytes, which are then excreted in urine. This excretion process is essential for regulating the body's fluid balance and removing toxins that can accumulate from metabolic processes.

In contrast, blood is a vital fluid that transports nutrients, oxygen, and waste products throughout the body, while hormones are signaling molecules that play critical roles in regulating various physiological processes. Glucose, on the other hand, serves as a primary energy source for cells and is not waste; rather, it is crucial for cellular metabolism. Therefore, urine stands out as a definitive waste material due to its role in the excretion of metabolic byproducts.