Sound waves are (require a medium to travel through) waves that are also (directions of sound movement).

Derek is working on a thesis on the changes in social behavior in the context of finding partners. an important part of his study concerns the various practices followed by males and females over the course of generations and how they have gradually transformed into our current social norms. derek can be called a(n) psychologist. (tb75)\

Brainliest to who answers! what is the function of a purchasing cooperative, or co-op?

The platt amendment was a treaty that allowed the united states to build military bases in which country?