I will give brain to the correct answer! Which statement best explains how sewage systems help fight the spread of disease?

A. They carry antibiotics that kill pathogens

B. They carry human waste to treatment facilities away from cities

C. They kill animals that spread pathogenic bacteria

D. They add chlorine to drinking water before it is transported to homes.​

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Explanation:

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The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world. it involves making observations, formulating a hypothesis, and conducting scientific experiments.the steps of the scientific method are •observation-the first step of the scientific method involves making an observation about something that interests you•question-once you've made your observation, you must formulate a question about what you have observed. •hypothesis-once you've made your observation, you must formulate a question about what you have observed. •experiment-once you've developed a hypothesis, you must design and conduct an experiment that will test it.•results-the results are where you report what happened in the experiment. •conclusion-the final step of the scientific method is developing a conclusion.i hope that this you : )

The answer is joseph is observing the colour of the reaction mixture to see whether proteins are present in the given solution.