Final answer:
Polyuria, polydipsia, and dilute urine are related symptoms indicating excessive urination, increased fluid intake, and an inability to concentrate urine properly.
Step-by-step explanation:
Polyuria, polydipsia, and dilute urine are symptoms related to excessive urination and fluid intake. Polyuria refers to urine production in excess of 2.5 liters per day and can be caused by conditions such as diabetes insipidus, diabetes mellitus, or excessive use of diuretics. Polydipsia is the frequent intake of water as a result of the increased urination. Dilute urine refers to urine that has a low concentration of solutes, indicating the body's inability to concentrate the urine properly.