Answer;
Radio networks
Explanation;
-Magazines were america s only national medium from the 1890s until the 1920s when radio networks was/were established.
-Radio network became an accepted commercial medium during the 1920s. Initially many thought it was too intrusive a medium to allow advertising, as it entered people’s homes by the end of the decade, advertising had become an integral aspect of programming.
Chronological thinking<span> is at the heart of historical reasoning. Without a strong sense of </span>chronology<span>--of when events occurred and in what temporal order--it is impossible for students to examine relationships among those events or to explain historical causality.
So I would think C</span>
Explanation:
After 1945, historians found the term "First World War" appropriate because they saw 1914-1918 as the first of a particular type of international conflict - the world's first industrialised "total" war - which had been followed by a second industrialised world war of this kind - 1939-1945.
Ecology<span> is the scientific study of interactions of organisms with one another and with the physical and chemical environment. It matters because you need to study organisms.</span>
Roaring Twenties is the term contributed to the Jazz age. It was the time which was in between the end of the world war and the beginning of great depression.
Explanation:
Jazz age is a period where in people set aside old conventions and embraced modernism. Jazz music is a king music genre which was introduced during the Harlem Renaissance. It had a kind of strong and lively rhythm which allured the Americans . Jazz is the music genre that does not belong to one race or culture.
Harlem renaissance saw many African American poets and many jazz musicians were on the upfront singing their heart out and all their songs revolved around slavery and the consequences of it which was heart touching and a fact which made many to realize the pain of discrimination.