GMAT Reading Comprehension (RC) | Scientist long believed that two nerve cluster in the human hypothalam

HelloGMATNinja , experts, and members

I have been solving RC passages for some time now but my accuracy is stuck between 30% to 50%. I am writing my notes here so that you can give me some advice on how I can improve these notes and how I can improve my accuracy in RC passages.


Passage notes:
Passage 1: Scientists (long believed): 2 nerve clusters (SCNs) controlled rhythms (cycles-24 hours)
- Studies suggest something about animals : SCNs control BP, temp., activity, alertness, and melatonin.

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