The document discusses the Kingdom Animalia. It defines Animalia as the kingdom that comprises all multicellular animals and notes there are over 9 million animal species found on Earth, ranging from single-celled to the polar bear and blue whale. All animal kingdom organisms are multicellular, eukaryotic, heterotrophic organisms that rely on other organisms for food. General characteristics of the kingdom include being multicellular, eukaryotic organisms that have multiple cells with mitochondria and depend on other organisms for nutrition.