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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. 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 …

  5. 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), …

  6. Insects and Spiders - Encyclopedia.com

    Insects are members of the Animalia kingdom and belong to the phylum Arthropoda, along with crustaceans. There are many classes of arthropods, including the insects and arachnids. Both are …

  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. Cnidaria | Encyclopedia.com

    Jun 8, 2018 · Cnidaria Cnidaria is one of the more primitive animal phyla. It includes aquatic organisms such as jellyfish, sea anemones, corals, and hydras. Most cnidarians are marine, although a few, …

  9. Bacteria - Encyclopedia.com

    May 21, 2018 · Bacteria Definition Bacteria are prokaryotes (unicellular organisms with no membrane-enclosed nucleus) with simple structures that typically range in size from about 0.5 to 20 …

  10. Chordata | Encyclopedia.com

    Jun 8, 2018 · Chordata (kingdom Animalia) A large phylum comprising the animals that possess a rod of flexible tissue (notochord), which is protected in higher forms by a vertebral column. The phylum …