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

The correct answer is option A, that is, from different social and ethnic backgrounds.

Explanation:

It can be witnessed from the given question that incorporating individuals from different societies, cultures, and background to take part in science is important for looking after the discriminations and increases the size of the scientifically trained workforce.  

It plays an important role as it leads to better science. The scientific progress relies on problem-solving and collaboration. The groups involving people with different experience and background seem to be more pioneering and creative.  

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

the answer is 1260

you spend 7 hours in school for 1 school day with 5 school days in 1 school week with 36 school weeks in a school year.

7*5*36= 1260 it's all about multiplying