A control group is going to be something that you don’t “experiment on or change. It is grown or watched under normal conditions. This way you have a medium to say how things are “supposed” to go.
The experimental group is going to be where you “experiment” and change the normal conditions to see what outcome will occur ( under different conditions then normal )
Answer:
I dont know what your experiment is but the control variable is the thing your keeping the same.
Explanation:
The circulatory system<span> comprises the </span>heart<span>, veins, capillaries and arteries. ... Once depleted of oxygen, the blood returns to the lungs and </span>heart<span>. To </span>maintain homeostasis<span>, the </span>circulatory system<span> delivers oxygen and nutrients in the blood so that they can pass into fluids surrounding the cells.</span>