Levi decides to examine the effect of fertilizer on the growth of tomato plants. He chooses four plants for his experiment and applies varying amounts of fertilizer to three of them. He does not apply fertilizer to one plant. Over a 15-day period, the plants receive fertilizer on Days 1, 4, 7, 10, and 13. Levi measures the height of all of his plants with a meterstick on Days 3, 6, 9, 12, and 15. He also makes sure to hold all experimental factors constant except for the fertilizer.

What is the independent variable in Levi's experiment on tomato plants?

An independent variable is a factor or condition in a scientific experiment that researchers deliberately manipulate or control to observe its effect on a dependent variable. It is the variable that is being tested to see if it causes a change in the dependent variable. Independent variables are a fundamental component of experimental design.

The independent variable in Levi's experiment on tomato plants is the amount of fertilizer applied to the plants. In Levi's experiment, he applies varying amounts of fertilizer to three out of the four plants, and doesn't apply fertilizer to one plant. By changing the amount of fertilizer, Levi is investigating how it affects the growth of the tomato plants.

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