The variable is the group that was given caffine, because thats what the doctors manipulated. They possibly altered the natural memory of the participants by giving them caffine. A more specific variable could be how much caffine each participant is given and what time are they given it.
answer : i will search a song
Explanation:
because sometime this thing will make us relax... hahhahahha this is my opinion
Answer:
hope this helps its like an outline of what you should do
Explanation:
I'm thinking Lack of Motivation. I'm going to double check though for you.