What was one of the first inventions that made it possible to communicate

What is the definition of evolution

The united states economy makes up how much of the worlds economy

Select the correct answer from each drop-down menu. different sources are aimed at different audiences. sometimes a source can be directed at more than a single group of usually aimed at the general population across the globe. some sources may have a very specific audience. be specifically aimed at students or scholars with a background in literature.