Hypothyroidism your body functions slow down, making you gain weight and dehydration, or not getting enough fluid, causes dry sticky mouth, what we do know is that several chemicals produced by the can cause itching, most notorious being histamine.
Operations Research (O.R.), or operational research in the U.K, is a discipline that deals with the application of advanced analytical methods to help make better decisions.
An operational definition is a process by which the characteristics of a concept can be defined, including identification and classification. It consists of the methods or tests that are used in analyzing a given variable or concept, which can be used to confirm the validity of the information obtained. simple example that shows the relationship between a conceptual definition and an operational definition: if the concept is weight, an operational definition could be the weight of an object as measured on a scale.