Sound is a wave passing through some __?__ 2. The speed of sound depends on the __? and ? of the medium through which it travels

answer; i believe the correct answer is prefrontal cortex;

the first question's answer is a.

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.

answer; during stalin"s rule, many mothers told their children that he was the greatest thing to ever happen to russia;