A) What are the dependent & independent variables?

an independent variable is a variable that we choose to change to see that happens. (eg. the temperature when testing evaporation).

a dependent variable is the variable that we measure. (so maybe how much water evaporates)

independent variable--can be controlled or manipulated.

dependent variable--is affected by changes made to the independent variable.

also important:

control variable (constant variable) - -remains the same throughout the entire experiment.