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
O from different social and ethnic backgrounds.
O from the most prestigious universities of the world.
O who possess a high degree of efficiency.
O who possess a high degree of skepticism.

The correct answer is "from different social and ethnic backgrounds".

Explanation:

One of the basis of scientific research is that it is universal, which means that it can be proved and replicated in anywhere in the world. In this case, one part of the study of a drug's absorption in the blood is taking place in Europe, while other part is taking place in Japan. This means that scientific knowledge progresses due to the effort of scientists from different social and ethnic backgrounds. Actually, the most ambitious scientific researches, such as The Human Genome Project, require the simultaneous effort of multiple research institutes in the world.

if you mean hydrogen and oxygen then water is the product