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  1. Animalia | Encyclopedia.com

    May 18, 2018 · Animalia The kingdom Animalia, or Metazoa, includes all animals. Animals are multicellular, eukaryotic organisms, which are heterotrophic, meaning they obtain nutrition from …

  2. Animal - Encyclopedia.com

    May 9, 2018 · Animal Animals are creatures in the kingdom Animalia, one of the five major divisions of organisms (the others are: Monera or bacteria , Fungi , Protists or protozoans, and Plantae or …

  3. Kingdoms of Life - Encyclopedia.com

    The eukaryotic Plantae, Fungi, and Animalia kingdoms contain mostly multicellular eukaryotes that differ in their structures, modes of nutrition, and life cycles (before reproduction).

  4. Metazoa | Encyclopedia.com

    May 8, 2018 · Metazoa (mĕt´əzō´ə), subkingdom of the animal kingdom comprising the multicellular animals in the traditional two-kingdom system of taxonomic classification, in which living organisms …

  5. Metazoan - Encyclopedia.com

    May 18, 2018 · Metazoan In the tenth edition of his book Systema Naturae (1758), Swedish botanist Carolus Linnaeus developed a biological classification system (now known as the Linnaean System) …

  6. Invertebrates - Encyclopedia.com

    May 18, 2018 · Invertebrates Invertebrates are animals without backbones. This simple definition hides the tremendous diversity found within this group which includes protozoa (single-celled animals), …

  7. Porifera - Encyclopedia.com

    May 23, 2018 · Porifera (Spongiaria, sponges) A phylum of aquatic Animalia, most of which are marine. They lack definite tissues and organs, but have a filter-feeding system composed of flagellate cells, …

  8. Reptile | Encyclopedia.com

    Jun 8, 2018 · Reptiles A reptile is an organism in the kingdom Animalia and the class Reptilia. (Kingdoms are the main divisions into which scientists classify all living things on Earth; kingdoms …

  9. Animals in Mythology - Encyclopedia.com

    Animals in Mythology Theme Overview Since the beginning of human history, people have lived in close contact with animals—usually as hunters and farmers—and have developed myths and legends …

  10. The Search for New Systems of Classification | Encyclopedia.com

    His original class names of Mammalia, Aves, Amphibia, and Insecta, along with his kingdoms of Plantae and Animalia, have survived the test of time. Scientists have since more than quadrupled the number …