A set of master control genes, known as (Choose) genes, regulates organs that develop in specific parts of the body. In flies, (Choose) genes determine the identities of each segment of the fly's body.

Which statement best describes how the loudness of the sound affects the high-pressure region created by the sound wave? a. a louder sound has no effect on the pressure created. b. a louder sound means a high-pressure region that is higher. c. a louder sound means a high-pressure region that is not as high.