#3 is Martin Luther King Jr. and Robert F. Kennedy. As a result, they left the nation in political turmoil.
It is called experimenter bias
experimenter bias refers to the cognitive bias that held by researchers that might cause them to subconsciously influence the outcome of the experiment.
The most likelt cause of this bias is a situation where experimenters held a certain belief or expectation for the outcome of the experiment.
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The more Carbon Dioxide in the air, the more it increases the GREENHOUSE EFFECT.