Is the following diagram a representation of a function?

Why or why not?
Is the following diagram a representation of a function?

Why or why not?
Is the following diagram a representation of a function?

Why or why not?
Is the following diagram a representation of a function?

Why or why not?
Is the following diagram a representation of a function?

Why or why not?
Is the following diagram a representation of a function?

Why or why not?
Is the following diagram a representation of a function?

Why or why not?
Is the following diagram a representation of a function?

Why or why not?
Is the following diagram a representation of a function?

Why or why not?
Is the following diagram a representation of a function?

Why or why not?
Is the following diagram a representation of a function?

Why or why not?
Is the following diagram a representation of a function?

Why or why not?
Is the following diagram a representation of a function?

Why or why not?
Is the following diagram a representation of a function?

Why or why not?