Which of the following describes the relationship between structure and function? The tails on sperm cells help them swim to the egg cell. The heart pumps blood through the body. The skin is made of many different layers

Consider the following planned experiment. factor experimental group control group light exposure tots of sun tots of sun amount of water weekly weekly type of soil nutrient rich nutrient rich size of pot large which variable is being tested in this experiment? small a. size of pot b. type of soil c. light exposure d. amount of water