<span>i am pretty sure it is clinical trial</span>
Hi Ace22704,
Answer - natural observation
I think this experimental method is a better option because its in a natural environment where the kids dont know whats happening unlike the suveys where you ask them questions which is probably a bad idea because they might feel scared and just change their minds.
Answer:
he will be tired and then play video games and gain weight
Explanation:
Answer:
Mantoux skin test required annually
