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This article explores the fundamental features of the Animal Kingdom, highlighting key characteristics such as multicellularity, eukaryotic structure, and heterotrophic ingestion processes. We delve into the significance of collagen as a connective protein, the presence of nerve and muscle tissues, and the diplontic (gametic) life history of animals. Additionally, we discuss the oogamous nature of gametes, the transition from zygote to blastula, and the process of larval metamorphosis into adult forms, revealing the concept of ontogeny recapitulating phylogeny.
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