Naming branches of the tree of life is arbitrary and dumb, write that down.
For kingdoms, there are three, or six. Bacteria, Archaea, Eurkarya. Some further divide Eukarya into Protists, Fungi, Plants and Animals.
You are a shit researcher when it comes to the internet, right here from the Wikipedia page on Biological Classes:
"The composition of each class is determined by a taxonomist. Often there is no exact agreement, with different taxonomists taking different positions. There are no hard rules that a taxonomist needs to follow in describing a class, but for well-known animals there is likely to be consensus. For example, dogs are usually assigned to the phylum Chordata (animals with notochords); in the class Mammalia; in the order Carnivora."
Why are you following me?
"He was the spearhead of the mod force. Everyone knew who he was and feared his wrath. There really isn't anyone like that anymore. Rowen didn't just delete their threads, he deleted their souls."