Answer:
(these answers are from the internet if you are doing an exam try to change the sentence structure )
Explanation:
constant : These are values that do not change during experiments.
For example, in an experiment where one wants to test how the growth of plants is affected by the amount of water, factors like type of soil, temperature, type of plant and sunlight all stay the same in the course of the experiment. These are hence referred to as the constants in this experiment, while the amount of water is the control.
control: A controlled variable is a variable that could change but is intentionally kept constant in order to clearly show the relationship between dependent and independent variables.
An example used to explain control variable is the effect of fertilizers on a plants growth, whereby the growth of plants differs based on the amount of fertilizer used. The fertilizer, in this case, is the control variable.
Other examples include time, pressure and temperature.
