So that they can see if the results are the same, and so that they can ask questions about the experiment and point out problems. Although some variation in results is acceptable, the results from different scientists should be similar- if the results are not similar and consistent then the experiment must be done again.
You need a variable. If something happens once it could just be chance. Like if you got a lottery ticket and won, it would just be chance. Not the thing that happens the most.
In studying caffeine, this is known to be and has been
researched to be a block adenosine induce inhibition in terms of the human’s
brain. With this, this could produce
negative effects to a person that could lead to certain complications.
