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The Animal Kingdom contains more than two million known species.
The Animal Kingdom contains these seven Phyla: Porifera, Cnidaria, Platyhelminthes, Annelida, Mollusca, Arthropoda, and Chordata.
The bodies of animals are made up of differentiated tissues to perform an equally specialized task, sometimes in to or three levels of differentiation (excluding sponges).
Most animals also reproduce sexually and are diploid, meaning they contain two copies of their genetic material.
Animals also lack cell walls, which are the primary structure of organisms in the Kingdom Plantae.
Mollusks, Crustaceans, and Nematodes make up most of all organisms, while Chordata, both the skeletal structure and the phyla that we are put in as humans take up a small fraction of organisms, in comparison.
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