The main idea of this paragraph is: Gertrude Elion was a determined woman who had real life and classroom experiences that helped her learn biochemistry. If sentence 3 is removed from the paragraph, what is the new main idea of the paragraph?

Gertrude Belle Elion was born on Jan. 23, 1918, in New York City.
She graduated from Hunter College in New York City with a degree in biochemistry in 1937.
Unable to obtain a graduate research position because she was a woman, she took a series of jobs, including lab assistant, chemistry and physics teacher in New York City high schools, and research chemist.
During this time she also took classes at New York University, where she earned a master's degree in 1941.
Because she could not devote herself to full-time studies, Elion never received a doctorate.

If sentence 3 is removed from the paragraph, the new main idea of the paragraph will be: Elion learned everything she needed to know from her courses.

Sentence 3 of the passage simply stated the efforts that Elion put into learning her desired course.

However, if this sentence is removed from the passage, the new idea that will be highlighted will be that Elion learned everything that she needed from her courses.

So, the effort that she put into learning the course would have been removed.

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