Why is On the Origin of Species described as “one long argument”?

Read the sentence. on days when i go jogging in the morning, my mind seems to process ideas faster, and my mood is more positive. how does the underlined clause add variety and meaning to the sentence? select two options. it describes the days being discussed. it makes readers want to go jogging. it creates a compound-complex sentence. it adds detail about the speaker's personality. it explains why jogging is beneficial.

Realism was a fairly influential and widespread literary movement in the united states in the latter half of the nineteenth century. which american writer is among the pioneers of american realism? a. ernest hemingway b. f. scott fitzgerald c. j. d. salinger d. mark twain

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