A medical research lab in Europe is studying a drug’s absorption in the blood. Another lab in Japan is trying to delay the elimination of this drug from the blood so that it can act in the body for a longer period of time. Based on this information, it can be concluded that scientific knowledge progresses due to the efforts of scientists

The two labs are in different parts of the world and are studying different aspects of the same drug: absorption and elimination. This shows how scientific knowledge can progress through contributions from scientists with different social and ethnic backgrounds, rather than depending only on prestige, efficiency, or skepticism. The correct choice is “from different social and ethnic backgrounds.”

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