Answer:
Check square 3 and 4. I used https://www.jfklibrary.org/learn/about-jfk/jfk-in-history/john-f-kennedy-and-people-with-intellectual-disabilities for a source.
Explanation:
I believe the answer is <span>The scientific method
</span><span>The scientific method filled on generally accepted standard in order to pursue a new scientific knowledge. The standard could take place in the form of investigating procedure, Generally accepted measurement, Precaution to avoid bias/mistake, etc.</span>