His discovery of the role of oxygen. He recognized and named oxygen and hydrogen and opposed the phlogiston theory. He helped construct the metric system, wrote the first extensive list of elements, and helped to reform chemical nomenclature.
The term muckraker<span> was used in the </span>Progressive Era<span> to characterize reform-minded American journalists who attacked established institutions and leaders as corrupt. They typically had large audiences in some popular magazines. In the US, the modern term is </span>investigative journalism<span> — it has different and more pejorative connotations in British English
</span><span>The muckrakers played a highly visible role during the Progressive Era period, 1890s–1920s</span>
<span>He was a strong defender of the Back-to-Africa movement. He was publisher, Journalist and Black Nationalist. He founded the Universal Negro Improvement Association and African Communities League (UNIA-ACL).Marcus Garvey, a foremost proponent of Pan-African and Black Nationalism.</span>
The event that signaled the shift and directional change of the SNCC is Stokely Carmichael became its leader in 1966. This happened when he became their leader and that he had many plans to this organization that helped the students also in protecting their rights of speech.
Today, we use the Gregorian<span> calendar so I believe it's A. </span><span>the 12 month calendar</span>
