Question

in the experiment the soil, plant species, container size, and water source were kept the same. which vocabulary term does this image represent? 1) variable 2) independent variable 3) dependent variable 4) controlled variable

Explanation:

In an experiment, constants are the factors that are kept the same to ensure that only the variable being tested affects the outcome. Here, soil, plant - species, container size, and water source are held constant.

Answer:

Constants