(1) scientists generally agree that earth is getting warmer due to what's called the greenhouse effect. (2) a greenhouse stays warm because sunlight and heat coming through the glass roof are mostly trapped. (3) the heat doesn't radiate back into the atmosphere because it's held in by the glass. (4) something like that happens on earth. (5) the atmosphere acts like a blanket that keeps the sun's heat from leaking away into space. which sentence is the paragraph's topic sentence? a. sentence 3 b. sentence 1 c. sentence 2 d. sentence 5

B

Sentence 1 is the paragraph's main topic. It works to introduce what the greenhouse effect is and it's there to establish that this is what scientists generally think causes the Earth to get progressively warmer.

A (sentence 3) cant be the main topic because this sentence is merely a detail of how the greenhouse effect works. Option D is not the answer because this is just additional information of how the greenhouse effect works on earth. Finally, option C (sentence 2) is not because it does not introduce the greenhouse effect, it only expands on the first sentence.

8 years 100% positive

explanation:

the progressive era is a period of widespread social activism and political reform across the united states that spanned from the 1890s to the 1920s.[1] the main objectives of the progressive movement were eliminating problems caused by industrialization, urbanization, immigration, and political corruption.

the movement primarily targeted political machines and their bosses. by taking down these corrupt representatives in office, a further means of direct democracy would be established. they also sought regulation of monopolies (trust busting) and corporations through antitrust laws, which were seen as a way to promote equal competition for the advantage of legitimate competitors.

many progressives supported prohibition of alcoholic beverages, ostensibly to destroy the political power of local bosses based in saloons, but others out of a religious motivation. at the same time, women's suffrage was promoted to bring a "purer" female vote into the arena.a third theme was building an efficiency movement in every sector that could identify old ways that needed modernizing, and bring to bear scientific, medical and engineering solutions; a key part of the efficiency movement was scientific management, or "taylorism".

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