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The video tutorial explains the concept of phylum, a key category in biological classification. It outlines the seven main categories used to classify living organisms: kingdom, phylum, class, order, family, genus, and species. The tutorial details the classification of horses and other animals within the kingdom Animalia, focusing on phylum cordata, which includes vertebrates, and phylum arthropoda, which includes invertebrates with exoskeletons. It also covers phylum mollusca, characterized by soft bodies. The video concludes by highlighting the ongoing nature of biological discoveries and the potential for changes in classification systems.

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