The best answer to fill in the blank would be ''Bystander'' because as that role you can go tell any adult or higher authority to stop the fighting so you don't try to be a hero and get yourself hurt as well.
It is true that many people infected with tapeworms maybe unaware of infection due to lack of symptoms.
A physical change is a change that the molecules of the article do not change so the answer is
a match chopping a piece of wood :))))
i hope this is helpful
have a nice day
