Why does the author include Nancy’s thoughts about a gaiety girl?

My friends asked me, “are you not coming for the party? "change into passive voice

If the four main points of this informational speech were changed 1. part-time job interviews ii. summer job interviews iii. college entrance interviews iv. full-time job interviews organization type would change from a. topical, cause-effect b. chronological, topical c. spatial, chronological d. cause-effect, spatial

She took up a scalpel and slit the monkey's abdomen, making a slow and gentle cut, keeping the blade well away from her gloved fingers. the spleen was puffed up and tough, leathery, like a globe of smoked salami. she did not see any bloody lesions inside this monkey. she had expected that the monkey's interior would be a lake of blood, but no, this monkey looked all right, it had not bled into itself. if the animal had died of ebola, this was not a clear case. she opened up the intestine. there was no blood inside it. the gut looked okay. then she examined the stomach. there she found a ring of bleeding spots at the junction between the stomach and the small intestine. this could be a sign of ebola, but it was not a clear sign. it could also be a sign of simian fever, not ebola. therefore, she could not confirm the presence of ebola virus in this animal based on a visual inspection of the internal organs during necropsy.