Can some one answer this

This is the process of making a prediction based on the results of prior observations of similar events.

Consider the following planned experiment. factor experimental group control group light exposure tots of sun tots of sun amount of water weekly weekly type of soil nutrient rich nutrient rich size of pot large which variable is being tested in this experiment? small a. size of pot b. type of soil c. light exposure d. amount of water

Which substance is a greenhouse gas that is emitted by human activities, is the most widespread, and remains in the air the longest?