• What is the Animal? Animals Characteristics, classification, information:
  • Animal is the common name of living beings classified in the world of animals (Animalia) in the world of eukaryotes (Eukaryota). The term “animal” is used in daily use to describe things that actually breathe and move, but also include humans in the biological context. The term “Animalia“, the scientific and Latin name of the animal kingdom, is the plural of the animal-derived animal which is also Latin and which means “living” or “spirit“. Another Latin scientific term that defines the animal world is Metazoa.


  • Generally, multi-cells are those who adapt to their environment and feed on other living things. Their bodies develop through the passage of some metamorphosis of the embryo. Eukaryotic multicellular organisms. They generally digest their food.


  • Most of the animals are mobile and the thick cell walls typical of plants are often absent. During embryonic development, large-scale cellular migrations and tissue organizations are seen. The ureters are sexually active as primary; Diploid chromosomes, and haploid chromosomal gametes with meiosis, which combine to form diploid zygotes.


  • More than 1.5 million living species have been identified, but the actual amount is estimated to be more than 20 million by some and more than 50 million by some.


  • Characteristics
  • There are many characteristic differences that distinguish animals from other living things. Animals are eukaryotes and are often very cellular. This separates them from bacteria and protozoans. Heterotrophs distinguish them from plants and algae if they can not produce their own food. The fact that the cell walls are not rigid distinguishes them from plants, algae and fungi. Animals move except some life stages. Many animal species pass through the blastula stage in the embryo stage, which is an animal-specific event.


  • Reproduction and development in animals
  • Almost all animals mate. Adults are diploid or polydiploid. Each has its own reproduction cell. Many animals mate and mingle.
  • Many animals evolve using sunlight energy indirectly. Unlike animals, plants use this light to produce simple sugars directly by photosynthesis. Plants convert carbon dioxide (CO2) from the air and water (H2O) molecules from the soil using light energy into a chemical reaction-ending Glucose sugar (C6H12O6) and finally leave the Oxygen O2 (O2). This sugar is then used to grow the plant. When the animals are eating these plants or when they eat the animals that eat these plants, they will have the sugar contained in the plants.






  • Animals breed in three different ways:
  • Internal reproductive and internal development: This breeding and development occurs in the form of sperm into the egg, resulting in fertilization and development of the embryo in the mother’s womb. It is seen in the memories.
  • Internal reproductive and external development: This reproductive and developmental sperm enters the egg, fertilize it, and together with the egg, the embryo goes out and develops outside. It is seen in animals that reproduce with eggs except for frogs and fish.
  • External reproduction and external development: When the mother leaves the unfertilized egg and the father develops the embryo with the fertilization of the eggs and develops outside the body. It is seen in frogs and fish.


  • Simple classification
  • Agnotozoa – Simple animals


  • Invertebrates
  • Parazoa – Animals without real texture
  • Placozoa
  • Porifera – Sponges
  • Eumetazoa – Animals with real texture
  • Radiata – Radial symmetric creatures
  • Bilateria – Bilateral symmetric organisms


  • The vertebrates
  • Acrania – Skullless
  • Hemichordata – Semi-backs
  • Urochordata (Tunicata)
  • Cephalochordata – Head chords
  • Craniata – Real skulls
  • Agnatha – Jawless animals
  • Gnathostomata – real jawed animals
  • Pisces – Fish
  • Tetrapoda – Four members
  • Amphibia – Two lives
  • Reptilia – Reptiles
  • Aves – Birds
  • Mammalia


Group Image Subgroup Estimated number of
described species
Vertebrates large goldfish facing right Fishes 32,900
green spotted frog facing right Amphibians 7,302
florida box turtle facing right Reptiles 10,038
Secretary bird gliding to the right Birds 10,425
drawing of squirrel facing right on branch Mammals 5,513
Total vertebrate species: 66,178
Invertebrates wasp facing right Insects 1,000,000
snail in shell facing right Molluscs 85,000
Tasmanian giant crab facing up with large left claw Crustaceans 47,000
Table coral at French Frigate Shoals, Northwestern Hawaiian Islands Corals 2,000
black spider Arachnids 102,248
drawing of Cambrian-aged soft-bodied, caterpillar Velvet worms 165
horse shoe crab on sand facing right Horseshoe crabs 4
  Others 68,658
Total invertebrate species: 1,305,075
Total for all animal species about: 1,371,253
  • (References: The World Conservation Union. 2014. IUCN Red List of Threatened Species, 2014.3. Summary Statistics for Globally Threatened Species.)
  • Over 95% of the described animal species in the world are invertebrates.


Author: wik Date: 5:46 pm
Science and Mathematics

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