This question is based on the following paragraph. the sentences are numbered to you answer the question.

(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 5
b. sentence 3
c. sentence 2
d. sentence 1

The answer is D.

The reason the answers is D because the topic is the general subject of a paragraph or essay. As you can see the author started listing some examples to support the main idea/topic.

a biography is a genre that mainly accounts somebody's life and that is written by somebody else. this genre supports sonia nazario's desire to share enrique's life because she can fully inform readers of his entire emotional journey.

in a biography, an author can share the readers almost everything about a person's life, or just one key event or personal aspect the author is interested in telling, like in this specific case in which sonia nazario is centered in enrique's emotional journey.