One reason is because of its given color. Typically, Algae or moss grows in saturated areas. The reason it is been is because doc its pigment, or chlorophyll found in its anatomy.
If a scientist is biased, then their result could be flawed or wrong; not to mention, it discredits their result from that experiment, and any other that they have participated in.
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Im in criminal justice classes so mine would be welp criminal justice