Why do scientists use models to explain atomic structure?

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions

'which of these statements about the scientific method is not true? all experiments must follow the same number of steps in the procedure. experiments may be repeated several times. some unexpected results can be beneficial. experimental results may or may not support the hypothesis.