What message does this political cartoon convey? What is the evidence? What was the purpose of this message?

the available body of facts or information indicating whether a belief or proposition is true or valid.

There are three purposes for a message: inform, persuade or goodwill. The first purpose is to inform where a message can be used to communicate routine, repetitive, daily tasks, instructions, codes, steps and procedures in the workplace.

Explanation:

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.