Explanation

No single experiment can ever prove the “truth,” or veracity, of a theory. Rationality is close but connotes the idea of the theory being logical, rather than factual.

For the second blank, in order for the theory to be supported, or “resilient,” the results from independent labs should agree with each other, or be consistent with each other.

Veracity, consistent with.
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Sandy
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rationality is closest to logic. We need a word that shows no a single experiment could ever tell us the truth or the veracity of a phenomenon.

Hope this helps
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