Purpose: does the amount of stirring affect the rate at which slat dissolves in water? hypothesis: if i increase the amount of then the salt will dissolve what is the independent variable: dependent variable:and 3 control variables: 1.

Hypothesis: If i increase the amount of stirs then the salt will dissolve faster

Independent: variable the amount of times you stir the liquid or rate at which you stir the liquid

dependent variable: the rate at which the salt dissolves

Materials: beaker, water, salt, and stir rod 

Cells of an organism tell each other when predators are near.