Ascientist discovered a new antibiotic and wanted to know if it would be effective against group a streptococcus bacteria. he designed a test experiment in a lab with ten different cultures of the bacteria. he introduced the antibiotic into five of the cultures, leaving the other five to grow without it. he recorded observations every three hours for a week. what is the independent variable in this experiment?

presence of the new antibiotic.

Explanation:

According to my research on the experimental process, I can say that based on the information provided within the question in this experiment the independent variable is the presence of the new antibiotic. This can be said because the differences in results do not necessarily depend on the new antibiotic since all of the cultures are being given the same antibiotic.

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