The word "who" is meant to refer to humans, so its use with mythological beings, animals and objects represents a grammatical error. This error can be seen in the text when the word "who" is used to refer to demons. Demons are not human beings, so they cannot be referenced by the words "who", being the correct one, use the word "which".
There is a grammatical error in: "forty little demons ... <u>who</u> are."
You could argue that since "demons" are not human beings but rather supernatural, evil spirits or entities (often meddling with humans' lives), they should not be referred to using the pronoun "who," but with "which."
However, it is understandable thanks to the context that the author is talking about human children here. Using the pronoun "which" to refer to them, although it would be grammatically correct, would sound very harsh because dehumanizing.
In most of the schools cell phones are not allowed and also most of the people think that cell phone has alot of disadvantages and in schools cell phones are the cause of disturbance.
