A student designed an experiment to test the effects of light and water on plant growth
How could this experiment be improved?
A. Add temperature as a variable
B. Add pH (acidity level) as a variable
C. Remove water or light as a variable,
so only one variable is tested at a time
D. All of the above

D. All of above

Explanation:

This is because we can add temperature as a variable to improve the light, pH as a variable to improve the water, and remove water or light as a variable to make the experiment on light or water even obvious.

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.