Final answer:
The statement that the chemical composition of urine varies throughout the day based on metabolic activity, water intake, and urinary output is true. The content of urine can differ based on factors including hydration levels and diet.
Step-by-step explanation:
The chemical composition of urine does indeed fluctuate throughout the day depending on factors such as metabolic activity, water consumption, and urinary output. This statement is true. Urine primarily consists of water, but it also contains waste products like urea, creatinine, and various dissolved ions. These components can vary with one's hydration level, dietary intake, exercise, and environmental conditions among other factors.