Ok idk what you talking about
Answer:
The number of students who smoked electronic cigarettes increased slowly between 2011 and 2015.
Explanation:
Because the time line is from 2011 to 2015 and students slowly smoked in these years. So The number of students who smoked electronic cigarettes increased slowly between 2011 and 2015 is the correct answer
Try and put in Key details on your speech and why the vaccine helps as well as some components how the vaccine helps the immune system