Animals are multicellular eukaryotic organisms that form the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and grow from a hollow sphere of cells, the blastula. In colloquial usage, as a consequence of anthropocentrism, the term animal is sometimes used nonscientifically to refer only to non-human animals.
About Animal in brief
Animals are multicellular eukaryotic organisms that form the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and grow from a hollow sphere of cells, the blastula. Animals range in length from 8. 5 micrometres to 33. 6 metres. They have complex interactions with each other and their environments, forming intricate food webs. Most living animal species are in Bilateria, a clade whose members have a bilaterally symmetric body plan. In colloquial usage, as a consequence of anthropocentrism, the term animal is sometimes used nonscientifically to refer only to non-human animals. Humans make use of many other animal species, such as for food, for materials, as pets, and as working animals including for transport. Non-human. animals have appeared in art from the earliest times and are featured in mythology and religion. The word \”animal\” comes from the Latin animalis, meaning having breath, having soul or living being. The biological definition includes all members of the kingdom animalia. In modern times, the biological classification of animals relies on advanced techniques. such as molecular phylogenetics, which are effective at demonstrating the evolutionary relationships between taxa. 6,331 groups of genes common to all living animals have been identified; these may have arisen from a single common ancestor that lived 650 million years ago. The blastula is a stage in embryonic development that is unique to most animals, allowing cells to be differentiated into specialised tissues and organs.
All animals are motile during at least part of their life cycle, but some animals, like sponges, corals, mussels, and barnacles, later become sessile. Nearly all animals use one digestive chamber with either one opening or two openings. Some animals fuse to form sexual gametes, ova ova, and the larger, non-motile spermatozoa. In particular, the placonges and desmosans—animal bodies—in particular, are differentiated into tissues, which enable locomotion and coordinate nerve signals and coordinate the body. In contrast, the cell junctions called tight, gap junctions, are held in place by cell walls, and develop so by progressive growth so that they can develop into cells of the cell type. In other words, animal cells possess the junctions so they can move about and be reorganised, making the formation of complex structures possible. The animal extracellular matrix forms a relatively flexible framework upon which cells can move around and be. reorganised. This may be calcified, forming structures such as shells, bones, and spicules. This may also be the case with other multice cellular organisms such as algae, which produce their own nutrients. Unlike plants and algae, animals are heterotrophic, feeding on organic material and digesting it internally. All animals respire aerobically.
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This page is based on the article Animal published in Wikipedia (as of Dec. 17, 2020) and was automatically summarized using artificial intelligence.
