Answer:
well for one if you have any younger sibling they usaully are following you around or your parents probally to make sure what their doing is right. Some might feel lonely so thats why they follow after people. I think reallt overall they are dependant on others because their tryibg to figure out whats right or wrong.
Explanation:
Hope that makes sense and helps
The one that could be contracted from airborne germs is : Chicken pox
Which why it spread easily. By being in the same room with an infected, you're very likely to be exposed with the viruses even though you never made a contact with the infected
hope this helps