You water some plants with 4 different types of water (salt water, regular water, sugar water and distilled water. after a two-week period, the height of the plants is measured

salt has a high concetration on mineral which can kill the plant. But it can also grow with distilled water bc it removes minerals and chemicals but it's better for indoor plants. And sugar will just kill the plant bc the plant already makes the nutrients it needs. Idk what you mean by regular water.

height can be measured with a ruler.

Im not sure what you asking but yea