Experimenter bias can best be controlled using Double-blind control.
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Melanin, a dark biological pigment (biochrome) found in skin, hair, feathers, scales, eyes, and some internal membranes; it is also found in the peritoneum of many animals (e.g., frogs), but its role there is not understood.
Explanation:
Answer:
because we must protect our DNA and mental psychology to the humanity doesn't lost. Some scientist working on DNA and they try to change some piece of DNA to identify can be change but I think this is a very dangerous and risky work