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If by animal you mean 'anything that respirates(oxygen)' then the two major subdivisions would be protozoic and metazoic. That is single celled and multi-celled. If by animal you mean 'Metazoic repirators(oxygen)' then the two major subdivisions would be protoastomes and dueterostomes. That is single opening to digestive tract and two openings to digestive tract. (With sponges forming a third branch that we will ignore for the sake of the two division criteria.)

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Nash Towne

Lvl 10
3y ago

What else can I help you with?