Question

explain why a scientist must conduct trials in humans before this procedure becomes a widespread medical treatment​

Answer 1

Scientists need to repeat studies many times to prove their hypothesis. This single study only shows an effect in mice. The effect in humans may differ, so scientists need to conduct trials in humans to see whether the results are the same.

Step-by-step explanation:

i got it from the official site where the question originated from, it was the sample answer, youre welcome, and thank you to the person below/above my answer, because their question is also right. <3

Answer 2

testing on animals and on humans are different

Step-by-step explanation:

If the testing through animals and/or artificial means turns out well and safe, then it is safe for human testing to work out how it will affect humans since we have a different physiology from animals.