Question

marcella has read an article on the internet that says plants grow better in acidic soil. she decides to test this statement by adding 15 milliliters of vinegar to the 0.5 l water container she uses to water one row of her marigolds. on the other row, she waters her marigolds with regular water from a 0.5 l container. she measures her marigold’s height each week for six weeks. 4. list two conditions to keep constant:

Explanation:

In a scientific experiment like this one testing plant growth in acidic - water vs regular water, to ensure valid results, factors other than the water type should be kept the same. The amount of water is important as different volumes can affect growth. Also, the amount of sunlight is crucial since plants need it for photosynthesis and different light levels can impact growth.

Answer:

1. Amount of water
2. Amount of sunlight