NSAIDs interact with the endocannabinoid system and its endocannabinoids, as COX2 have been shown to utilize endocannabinoids as substrates, and may have a key role in both the therapeutic and adverse effects of NSAIDs, as well as in NSAIDs-induced placebo responses.
Definition: An independent variable is the variable that is changed or controlled in a scientific experiment. Independent variables are the variables that the experimenter changes to test their dependent variable.
The independent variable is the variable that is manipulated by the researcher during an experiment. In this case, the independent variable is the vitamin substance that is being given to the plant. This is controlled by the experimenting scientist. The dependent variable is the amount of plant growth.