Ascientist who is skeptical about a particular study can decide to run that study in their laboratory. this would represent the original research study.

replicating.

Explanation:

If a scientist has doubts about a study thathas been conducted, he might be interested in determining wheter the results are true in other settings or for other populations. In this case, the scientist may want to replicate the experiment. It means to repeat the research or study, generally with different situations and different subjects, to determine if the original study can be applied to other situations.

answer; they are called (pebbling);

answer; ///approx///5,000 miles;