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  • Animalia | Encyclopedia. com
    Animalia The kingdom Animalia, or Metazoa, includes all animals Animals are multicellular, eukaryotic organisms, which are heterotrophic, meaning they obtain nutrition from organic sources Most animals obtain nutrition by ingesting other organisms or decomposing organic material
  • Animal - Encyclopedia. com
    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 plants) Animals are multicellular, eukaryotic organisms, with cells that do not have walls made of cellulose Animals are capable of voluntary, spontaneous movements, often in response to sensory perceptions
  • Metazoan - Encyclopedia. com
    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) that placed all organisms into seven hierarchical groupings He suggested that all organisms could be classified as belonging to two kingdoms, the Plantae (plants) and the Animalia (animals), and that members of
  • 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)
  • Reptile | Encyclopedia. com
    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 are further subdivided into phylums [or divisions], classes, and orders ) The reptiles include more than 6,000 species grouped into four orders: the turtles (Chelonia), the snakes and lizards (Squamata), the
  • Animal Ecology - Encyclopedia. com
    Animal ecology concerns the relationships of individuals to their environments, including physical factors and other organisms, and the consequences of these relationships for evolution, population growth and regulation, interactions between species, the composition of biological communities, and energy flow and nutrient cycling through the ecosystem From the standpoint of population, the
  • Porifera - Encyclopedia. com
    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, pores, and canals Most are covered externally by either a cortex or a dermis
  • Cnidaria | Encyclopedia. com
    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, such as the well-known hydra, are freshwater species
  • Rotifera - Encyclopedia. com
    Rotifera The 1,500 to 2,000 species in the phylum Rotifera, like other members of the kingdom Animalia, are multicellular, heterotrophic (dependent on other organisms for nutrients), and lack cell walls
  • Metazoa | Encyclopedia. com
    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 were considered to be either plants or animals





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