In an investigation designed to determine the effect of the amount of water on plant growth, two groups of equal-sized bean plants of the same species were grown under identical conditions, except for the amount of water they were given. one group was watered with 200 milliliters of water once a day, while the other group was watered with 400 milliliters of water once a day. after several days, the heights of the plants were measured. it was determined that the plants watered with 400 milliliters of water once a day showed more growth. the variable in this investigation is the

The height of the plants

Explanation:

In an experimental design, there are two types of variables: independent and dependent variables. The dependent variable is modified by the independent one. In other words, researchers can change the independent variable to see the possible effect in the dependent one. In this example, the study wants to see the effect of the amount of water (independent variable) on plant growth (dependent variable). They evaluate the height of the plants (growth) exposed to different volumes of water. So, the variable of interest in this study is the height of the plants.

the real answer is b. scintillation counter

they dont have any evidence