What does bias have to do with comparison and contrast

Bias means when someone uses favoritism. When you are being unfair by making your opinion make you chose a certain options. For example, someone was asked to chose a contestant on a dance competition by their turns and facial expression. You saw the one of the two contestants earlier before the competition and they said said "THAT is the judge?" woah there are old. That made you upset so you chose the other contestant because you were mad. If you make your own opinions about something you are comparing then you are not being fair about one subject you talk about in Comparison and Contrast. 

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To form soil, the two processes which must occur are erosion and weathering, so the correct answer is "soil formation is a continuous presses, but also one which takes a long time, it can sometimes take more than five hundred years for 1cm of soil to form.