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Animals have several characteristics that set them apart from other living things. Animals are eukaryotic and multicellular. [14] Unlike plants and algae, which produce their own nutrients, [15] animals are heterotrophic, [16] [17] feeding on organic material and digesting it internally. [18] With very few exceptions, animals respire aerobically.
The following is a list of the classes in each phylum of the kingdom Animalia. There are 107 classes of animals in 33 phyla in this list. However, different sources give different numbers of classes and phyla. For example, Protura, Diplura, and Collembola are often considered to be the three orders in the class Entognatha. This list should by ...
Animals are multicellular eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material , breathe oxygen , are able to move , reproduce sexually , and grow from a hollow sphere of cells, the blastula , during embryonic development .
The taxonomic uncertainty was such that, for example, some Ichthyosporea were traditionally treated as trichomycete fungi. [ 1 ] Holozoa was first recognized as a clade in 2002 through a phylogenomic analysis by Franz Bernd Lang, Charles J. O'Kelly and other collaborators, as part of a paper published in the journal Current Biology .
Traditionally, textbooks from Canada and the United States have used a system of six kingdoms (Animalia, Plantae, Fungi, Protista, Archaea/Archaebacteria, and Bacteria or Eubacteria), while textbooks in other parts of the world, such as Bangladesh, Brazil, Greece, India, Pakistan, Spain, and the United Kingdom have used five kingdoms (Animalia ...
All members of the cat family have the following characteristics in common: They are digitigrade and have five toes on their forefeet and four on their hind feet. Their curved claws are protractile and attached to the terminal bones of the toe with ligaments and tendons. The claws are guarded by cutaneous sheaths, except in the Acinonyx. [12]
Sexual dimorphism in lions is the most prominent among felids Sexual dimorphism is the condition where sexes of the same species exhibit different morphological characteristics, particularly characteristics not directly involved in reproduction. [61] Sexual dimorphism in carnivorans, in which males are larger than females, is common.
A concept based on purely morphological characteristics pictures the Placozoa as the nearest relative of the animals with true tissues . The taxon they share, called the Epitheliozoa , is itself construed to be a sister group to the sponges ( Porifera ):