Respuesta :

Alkatoe
uncontaminated. it allows researchers or forensics to compare it with another sample

Answer: uncontaminated

Explanation:

A substrate which is used as a control in research or experiments, is uncontaminated type of substrate. This substrate is used to compare, match or vaildation of results with the samples.

This control substrate allows it to compare with other variables and their results in an experiment.

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