Women born with an extra x chromosome (xxx) are generally healthy and indistinguishable in appearance from normal xx women. what is a likely explanation for this finding? how could you test this explanation?

Dr. arenas is a scientist who has been trying to determine if increasing pressure will increase the sound that occurs when two chemicals explode. it measures the volume of the sound that occurs at the minimum pressure at which the explosion will occur. it then increases the pressure and measures the volume of the explosions that occur. what kind of investigation is the scientist conducting?