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About animal kingdom?
Animal or the kingdom Animalia, a classification of living organisms.Animals are multicellular, eukaryotic organisms of the kingdom Animalia or Metazoa. Their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later on in their life. Most animals are motile, meaning they can move spontaneously and independently. All animals must ingest other organisms or their products for sustenance (see Heterotroph).Animals have several characteristics that set them apart from other living things. Animals are eukaryotic and multicellular which separates them from bacteria and most protists. They are heterotrophic,generally digesting food in an internal chamber, which separates them from plants and algae. They are also distinguished from plants, algae, and fungi by lacking rigid cell walls. All animals are motile, if only at certain life stages. In most animals, embryos pass through a blastula stage,] which is a characteristic exclusive to animals.
Structure

With a few exceptions, most notably the sponges (Phylum Porifera) and Placozoa, animals have bodies differentiated into separate tissues. These include muscles, which are able to contract and control locomotion, and nerve tissues, which send and process signals. Typically, there is also an internal digestive chamber, with one or two openings.Animals with this sort of organization are called metazoans, or eumetazoans when the former is used for animals in general.


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