Ascientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. another scientist conducted the same experiment and got similar results. which concept does this best illustrate?

The concept of repetition is best illustrated in the given question.

Explanation:

Let us consider that a  scientist named A conducted an experiment in his or her laboratory. He discovered a new fertilizer, and when the small amount of that when added to the plant it grows very briskly. Similarly, when an another scientist named B performed the similar experiment in the lab and obtained identical outcomes, which means that scientist B is repeating the same experiment that was done by the scientists A. Thus, it explains the concept of repetition.

how important do you think an instrument is to the musician who plays it?