Subject: questions on 5 kingdoms and classfication

Hi there, 
1)I would like to find out more about things alive in some sense but usually 
not included in the 5 kingdoms. I only managed to find viruses.

2)I would also like to know the basis of naming new species and classfiying 
them. Who gets to name a new species? Is it the person that first discovers it 
names it?

3) Are dinosaurs examples of extinct species before they can be classfied? I 
would also like to know more species that are extinct before they can be 
classfied.

4) Why do scientists believe that the 5 kingdoms of classifying living things 
are inadequate? Why do they think this way? What are other alternatives of 
classifying them ?

Thanks in advance. :)

Re: questions on 5 kingdoms and classfication