To test the quality of water sources in her area, Shameka collects five samples from each water source and tests the quality of each sample. Which important step of scientific design is Shameka conducting?

repetition

replication

verification of results

using controlled variables

The answer is "Verification of results ".

Explanation:

The scientific system consisted inside an iterative or cyclical process which experimental results and technically confirm a theory. There are four things which scientific design aims people explain:  

Its first stage of analysis involves collecting the samples taken for the current context, that are the focus of discussion, and then testing the samples taken to determine the absorbance of soft and hard salts throughout the water. It is required for water quality to be determined. Therefore, the collection and testing of samples falls under the scientific design category of classification, whereby Shamekha tried to verify the findings.