In what two ways does the author develop the central idea of the passage? The author presents the differences between light and sound waves.
The author gives examples of how sound travels through various substances and surfaces.
The author describes how different surfaces affect the speed of sound.
The author explains that it is easier to gather information about sound waves.
The author uses light waves to specify how inferior sound waves are at traveling through barriers.

El autor da ejemplos de cómo el sonido viaja a través de diversas sustancias y superficies.

El autor usa ondas de luz para especificar qué tan inferiores son las ondas de sonido para atravesar barreras.

Explanation:

ESPERO HABERTE AYUDADO

recent brain research has shown some surprising benefits as a result of formal musical training. learning to play a musical instrument appears to develop parts of the brain that can even influence academic results. the studies indicate that the earlier a child begins training, the more benefits there are. one such study showed that children who began musical studies before the age of seven had a more developed brain in the region where language production and auditory processing take place. scientists believe there is mounting evidence to show that early musical training can improve brain function.

explanation: