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Investigate the effect of [[antiseptic]]s and [[antibiotic]]s on [[bacteria]]l colonies.
===Method===
*[[Dependent Independent Variable]] - The antiseptic or antibiotic used.*[[Independent Dependent Variable]] - Observe the growth of colonies.
*[[Control Variable]]s - The same quantity of antiseptic and antibiotic. The same spread of [[bacteria]] applied to the growth medium. Incubated for the same length of time. Incubated at the same temperature. Only one type of [[bacteria]] used.