Animali

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animali

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animali

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Thanks for your vote! We truly appreciate your support.Animalkingdom Animaliaany of a group of multicellular eukaryotic organisms i. They are thought to have evolved independently from the unicellular eukaryotes.

Animals differ from members of the two other kingdoms of multicellular eukaryotes, the plants Plantae and the fungi Mycotain fundamental variations in morphology and physiology. This is largely because animals have developed muscles and hence mobility, a characteristic that has stimulated the further development of tissues and organ systems.

Animals are multicellular eukaryotes whose cells are bound together by collagen. Animals dominate human conceptions of life on Earth because of their size, diversity, abundance, and mobility. The presence of muscles and mobility is one of the primary characteristics of the animal kingdom.

The two major groups of animals are vertebrates and invertebrates. Vertebrates have backbones, and invertebrates do not. Animals first appeared in the Ediacaran Periodabout million to million years ago, as soft-bodied forms that left traces of their bodies in shallow-water sediments. Animals' basic functional systems include a musculoskeletal system, for supporting and moving the body; a nervous systemfor receiving and processing sensory information and for carrying signals to control muscle and hormone activity; an endocrine systemfor secreting hormones to chemically control bodily functions; a digestive system, for receiving and processing food; a circulatory systemfor carrying nutrients and oxygen to cells and carrying away their wastes; and a reproductive systemfor producing offspring to ensure species survival.

Animals dominate human conceptions of life on Earth not simply by their size, abundance, and sheer diversity but also by their mobility, a trait that humans share. So integral is movement to the conception of animals that sponges, which lack muscle tissues, were long considered to be plants. Only after their small movements were noticed in did the animal nature of sponges slowly come to be recognized.

In size animals are outdone on land by plants, among whose foliage they may often hide. In contrast, the photosynthetic algae, which feed the open oceans, are usually too small to be seen, but marine animals range to the size of whales. Diversity of form, in contrast to size, only impinges peripherally on human awareness of life and thus is less noticed.

Nevertheless, animals represent three-quarters or more of the species on Earth, a diversity that reflects the flexibility in feeding, defense, and reproduction which mobility gives them. Animals follow virtually every known mode of living that has been described for the creatures of Earth. Animals move in pursuit of food, mates, or refuge from predators, and this movement attracts attention and interest, particularly as it becomes apparent that the behaviour of some creatures is not so very different from human behaviour.

Other than out of simple curiosity, humans study animals to learn about themselves, who are a very recent product of the evolution of animals. Animals evolved from unicellular eukaryotes. The presence of a nuclear membrane in eukaryotes permits separation of the two phases of protein synthesis: transcription copying of deoxyribonucleic acid DNA in the nucleus and translation decoding of the message into protein in the cytoplasm.

Compared to the structure of the bacterial cellthis gives greater control over which proteins are produced. Such control permits specialization of cells, each with identical DNA but with the ability to control finely which genes successfully send copies into the cytoplasm.

Tissues and organs can thus evolve. The semirigid cell walls found in plants and fungi, which constrain the shape and hence the diversity of possible cell types, are absent in animals. If they were present, nerve and muscle cells, the focal point of animal mobility, would not be possible. Article Media.

Info Print Print. Table Of Contents. Submit Feedback. Thank you for your feedback. Home Science Biology. Virginia C. See Article History.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 cells are characterized by their lack of a rigid cell wall exhibited by fungi and plants.

Instead, animal cells are held together by structural proteins such as collagen. All animals, except for the sponges, are made up of cells organized into tissues that are specialized for some function. As a result, most animals are capable of complex behavioral responses and rapid movement. Most animals are diploidmeaning they have two copies of all genetic information for most of their life cycle. Most animals reproduce sexually with differentiated sex cells.

These cells large, nonmotile eggs and small, motile sperm fuse to form a new diploid individual called a zygote. The zygote undergoes a series of cell divisions, called cleavage, to form a hollow, multicellular ball known as a blastula.

The blastula then folds in on itself to form a gastrula, a double-walled structure with an opening to the outside called the blastopore. Some animals including all mammals develop and mature directly into adults but the development of most animals includes larval stages. Larvae are immature forms that are morphologically distinct from adults.

The process of metamorphosis transforms larvae into their adult form. A familiar example is the metamorphosis of a tadpole into a frog. Although taxonomists disagree about the identity of major animal groups and the relationships among them, most agree that Animalia is monophyletic. This means that all animals can trace their descent to a single common ancestor. There are approximately thirty-two living animal groups, or phyla, each with a distinctive body plan and biological properties.

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All of these are the survivors of the one hundred or so animal phyla that evolved during the Cambrian explosion. This incredible diversity of animal body plans and lifestyles arose in the relatively short period of 40 million years, between and million years ago.

All of today's remarkably diverse animal forms are variations on the basic body plans that evolved during the Cambrian. The most primitive animal group is the phylum Porifera, the sponges.

The remaining animal groups can be divided into radial and bilaterally symmetric animals.

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Radially symmetric animals are the cnidarians, including jellyfish, corals, and anemones, and ctenophores, or comb jellies. Bilaterally symmetric animals which include all vertebrates are further divided based on types of body cavities and variations on the pattern of gastrula formation during development.

Flatworms, phylum Platyhelminthes, have no body cavity. Ten phyla of animals, including nematodes and rotifers, have a primitive type of body cavity.

All other animals have a true body cavity and are divided into two major groups. Protostomes include Mollusca clams, snails, and octopiAnnelida segmented wormsArthropoda spiders, crustaceans, and insectsand several minor phyla.

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Deuterostomes include Echinodermata sea stars and sea urchinstwo proto-chordate phyla, and Chordata tunicates, lancelets, sharks, fish, amphibians, snakes and lizards, birds, and mammals.

Campbell, Neil A.Entry 1 of 2 1 : any of a kingdom Animalia of living things including many-celled organisms and often many of the single-celled ones such as protozoans that typically differ from plants in having cells without cellulose walls, in lacking chlorophyll and the capacity for photosynthesisin requiring more complex food materials such as proteinsin being organized to a greater degree of complexity, and in having the capacity for spontaneous movement and rapid motor responses to stimulation 2 a : one of the lower animals see lower entry 3 sense 3 as distinguished from human beings b : mammal broadly : vertebrate 3 : a human being considered chiefly as physical or nonrational also : this nature 4 : a person with a particular interest or aptitude a political animal He's a party animal.

Plants breathe too, by taking in certain gases from the atmosphere and releasing others. However, this process cannot be observed by the naked eye. So the noun animal, which comes from animalis, was borrowed from Latin for that group of living beings that breathe visibly. Examples of animal in a Sentence Noun the animals in the zoo the plants and animals of the forest She loves all kinds of animals.

Fish, birds, insects, reptiles, mammals, and human beings are all animals. You're all behaving like a bunch of animals. Adjective several different plant and animal species milk, meat, and other animal products People were shocked by the animal brutality of the attack.

animali

Tony Evers announced Tuesday. Send us feedback. See More First Known Use of animal Noun 14th century, in the meaning defined at sense 1 Adjectivein the meaning defined at sense 1 History and Etymology for animal Noun and Adjective Latin, from animaleneuter of animalis animate, from anima soul — more at animate Keep scrolling for more Learn More about animal Share animal Post the Definition of animal to Facebook Share the Definition of animal on Twitter Time Traveler for animal.

See more words from the same century From the Editors at Merriam-Webster. Sly Fox, Fat Cat: Animal Names for People From 'lame duck' to 'lounge lizard' Dictionary Entries near animal animadversion animadvert animae mundi animal animal bipes implume animal black animal cellulose. Accessed 11 Oct. Keep scrolling for more More Definitions for animal animal. Entry 1 of 2 : a living thing that is not a human being or plant : any living thing that is not a plant : a person who behaves in a wild, aggressive, or unpleasant way animal.

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Entry 1 of 2 1 : any of a kingdom Animalia of living things including many-celled organisms and often many of the single-celled ones as protozoans that typically differ from plants in having cells without cellulose walls, in lacking chlorophyll and the capacity for photosynthesis, in requiring more complex food materials as proteinsin being organized to a greater degree of complexity, and in having the capacity for spontaneous movement and rapid motor response to stimulation 2 a : one of the lower animals as distinguished from human beings b : mammal broadly : vertebrate animal.

Please tell us where you read or heard it including the quote, if possible. Test Your Vocabulary Forms of Government Quiz A gerontocracy is rule by: elders soothsayers unwritten laws animals Can you spell these 10 commonly misspelled words? Test Your Knowledge - and learn some interesting things along the way.

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Convening on 'Counsel' and 'Council' We drop the gavel. Ask the Editors 'Intensive purposes': An Eggcorn We're intent on clearing it up 'Nip it in the butt': An Eggcorn We're gonna stop you right there Literally How to use a word that literally drives some pe Is Singular 'They' a Better Choice?

Or something like that. A challenging quiz of changing words. Can you spell these 10 commonly misspelled words? Do you know the person or title these quotes desc Login or Register.Start your free trial today and get unlimited access to America's largest dictionary, with: More thanwords that aren't in our free dictionary Expanded definitions, etymologies, and usage notes Advanced search features Ad free!

Join Our Free Trial Now! See more words from the same year Dictionary Entries near animalia animal husbandman animal husbandry animal hypnosis animalia animalic animalier animalism. Accessed 11 Oct. Comments on animalia What made you want to look up animalia? Please tell us where you read or heard it including the quote, if possible.

Test Your Vocabulary Forms of Government Quiz A gerontocracy is rule by: unwritten laws soothsayers elders animals Can you spell these 10 commonly misspelled words?

Test Your Knowledge - and learn some interesting things along the way. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Convening on 'Counsel' and 'Council' We drop the gavel. Ask the Editors 'Intensive purposes': An Eggcorn We're intent on clearing it up 'Nip it in the butt': An Eggcorn We're gonna stop you right there Literally How to use a word that literally drives some pe Is Singular 'They' a Better Choice? Or something like that.

animali

A challenging quiz of changing words. Can you spell these 10 commonly misspelled words? Do you know the person or title these quotes desc Login or Register. Save Word. Definition of animalia. Love words? First Known Use of animaliain the meaning defined above. History and Etymology for animalia New Latin, from Latin, plural of animal. Keep scrolling for more. Learn More about animalia. Time Traveler for animalia The first known use of animalia was in See more words from the same year.

Dictionary Entries near animalia animal husbandman animal husbandry animal hypnosis animalia animalic animalier animalism See More Nearby Entries.

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Statistics for animalia Look-up Popularity. Get Word of the Day daily email!Animals also called Metazoa are multicellular eukaryotic organisms that form the biological kingdom Animalia. With few exceptions, animals consume organic materialbreathe oxygenare able to movecan reproduce sexuallyand grow from a hollow sphere of cells, the blastuladuring embryonic development. Over 1. Animals range in length from 8. They have complex interactions with each other and their environments, forming intricate food webs.

The kingdom Animalia includes humans but in colloquial use the term animal often refers only to non-human animals. The scientific study of animals is known as zoology. Most living animal species are in Bilateriaa clade whose members have a bilaterally symmetric body plan. The Bilateria include the protostomes —in which many groups of invertebrates are found, such as nematodesarthropodsand molluscs —and the deuterostomescontaining both the echinoderms as well as the chordatesthe latter containing the vertebrates.

Life forms interpreted as early animals were present in the Ediacaran biota of the late Precambrian. Many modern animal phyla became clearly established in the fossil record as marine species during the Cambrian explosionwhich began around million years ago. Historically, Aristotle divided animals into those with blood and those without. Carl Linnaeus created the first hierarchical biological classification for animals in with his Systema Naturaewhich Jean-Baptiste Lamarck expanded into 14 phyla by InErnst Haeckel divided the animal kingdom into the multicellular Metazoa now synonymous for Animalia and the Protozoasingle-celled organisms no longer considered animals.

In modern times, the biological classification of animals relies on advanced techniques, such as molecular phylogeneticswhich are effective at demonstrating the evolutionary relationships between taxa.

Humans make use of many other animal speciessuch as for food including meatmilkand eggsfor materials such as leather and woolas petsand as working animals including for transport. Dogs have been used in huntingwhile many terrestrial and aquatic animals were hunted for sports. 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 animalismeaning having breathhaving soul or living being. Animals have several characteristics that set them apart from other living things.

Animals are eukaryotic and multicellular, [7] [8] unlike bacteriawhich are prokaryoticand unlike protistswhich are eukaryotic but unicellular. Unlike plants and algaewhich produce their own nutrients [9] animals are heterotrophic[8] [10] feeding on organic material and digesting it internally.

The blastula is a stage in embryonic development that is unique to most animals, [14] allowing cells to be differentiated into specialised tissues and organs. All animals are composed of cells, surrounded by a characteristic extracellular matrix composed of collagen and elastic glycoproteins. This may be calcified, forming structures such as shellsbonesand spicules. With few exceptions—in particular, the sponges and placozoans —animal bodies are differentiated into tissues. Typically, there is also an internal digestive chamber with either one opening in Ctenophora, Cnidaria, and flatworms or two openings in most bilaterians.

Nearly all animals make use of some form of sexual reproduction.High is the highest price registered in the last 24 hours. Low is the lowest price registered in the last 24 hours. Volume is the amount of currency that trade hands from sellers to buyers as a measure of activity. Change is the difference between the current price and the last trade.

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