The part of the wave labeled b is the ?
see picture

Has magnification ability of hundreds of thousands of times

Which if the following best describes why invertebrates isn’t considered a scientifically valid word when classifying animals

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?