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Other Animals

Animals are a major group of organisms, classified as the kingdom Animalia or Metazoa. In general they are multicellular, capable of locomotion and responsive to their environment, and feed by consuming other organisms. more...

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TurtlesTurtles

Their body plan becomes fixed as they develop, usually early on in their development as embryos, although some undergo a process of metamorphosis later on.

The name animal comes from the Latin word animal, of which animalia is the plural, and ultimately from anima, meaning vital breath or soul.

Characteristics

Aristotle divided the living world between animals and plants, and this was followed by Carolus Linnaeus in the first hierarchical classification. Since then biologists have begun emphasizing evolutionary relationships, and so these groups have been restricted somewhat. For instance, microscopic protozoa were originally considered animals because they move, but are now treated separately.

Kingdom Animalia has several characteristics that set it 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 cell walls.

Structure

With a few exceptions, most notably the sponges (Phylum Porifera), animals have bodies differentiated into separate tissues. These include muscles, which are able to contract and control locomotion, and a nervous system, which sends and processes signals. There is also typically 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.

All animals have eukaryotic cells, surrounded by a characteristic extracellular matrix composed of collagen and elastic glycoproteins. This may be calcified to form structures like shells, bones, and spicules. During development it forms a relatively flexible framework upon which cells can move about and be reorganized, making complex structures possible. In contrast, other multicellular organisms like plants and fungi have cells held in place by cell walls, and so develop by progressive growth. Also, unique to animal cells are the following intercellular junctions: tight junctions, gap junctions, and desmosomes.

Reproduction and development

Nearly all animals undergo some form of sexual reproduction. Adults are diploid or occasionally polyploid. They have a few specialized reproductive cells, which undergo meiosis to produce smaller motile spermatozoa or larger non-motile ova. These fuse to form zygotes, which develop into new individuals.

Many animals are also capable of asexual reproduction. This may take place through parthenogenesis, where fertile eggs are produced without mating, or in some cases through fragmentation.

Read more at Wikipedia.org


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The Other End of the Leash: Why We Do What We Do AThe Other End of the Leash: Why We Do What We Do A $4.49 How Cats and Other Animals See at Night by Christine HondersHow Cats and Other Animals See at Night by Christine Honders $7.89
New ListingI Wonder Why Camels Have Humps: And Other Ques- Ganeri, 9781856976633, paperbackNew ListingI Wonder Why Camels Have Humps: And Other Ques- Ganeri, 9781856976633, paperback $3.98 Whales and Other Marine Mammals of Washington and Oregon by Tamara EderWhales and Other Marine Mammals of Washington and Oregon by Tamara Eder $4.91
Draw 50 Dinosaurs And Other Prehistoric Animals The Step-By-Step WaDraw 50 Dinosaurs And Other Prehistoric Animals The Step-By-Step Wa $4.99 My Family and Other Animals. by Durrell, GeraldMy Family and Other Animals. by Durrell, Gerald $4.09
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fuzzy emu journal And Diaries And Other Ones Alsofuzzy emu journal And Diaries And Other Ones Also $15.00 Saving the World and Other Extreme Sports : A Maximum Ride NovelSaving the World and Other Extreme Sports : A Maximum Ride Novel $4.13
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Hong Kong or Other Breyer-Like Traditional Western Horse SaddleHong Kong or Other Breyer-Like Traditional Western Horse Saddle $15.00 New ListingDrawing Manga Animals, Chibis, and Other Adorable Creatures by J. C. Amberlyn.New ListingDrawing Manga Animals, Chibis, and Other Adorable Creatures by J. C. Amberlyn. $6.70
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Friends Help Each Other: Ready-to-Rea- 9781481403665, Farrah McDoogle, paperbackFriends Help Each Other: Ready-to-Rea- 9781481403665, Farrah McDoogle, paperback $3.62 New ListingWorld of Wonders: In Praise of Fireflies, Whale Sharks, and Other AstonishmentsNew ListingWorld of Wonders: In Praise of Fireflies, Whale Sharks, and Other Astonishments $7.02
$4.13 How to Draw a Unicorn and Other Cute Animals with Simple Shapes in 5 StepsHow to Draw a Unicorn and Other Cute Animals with Simple Shapes in 5 Steps $4.09
Never Smile at a Monkey: And 17 Other Important Things to RememberNever Smile at a Monkey: And 17 Other Important Things to Remember $4.09 My Family and Other AnimalsMy Family and Other Animals $4.69
Max Factory Figma & other anime figures *Us seller*Max Factory Figma & other anime figures *Us seller* $40.00 to Bats and Other Animals of the Night (Pictureback(RBats and Other Animals of the Night (Pictureback(R $4.49
My Family and Other Animals by Durrell, Gerald , PaperbackMy Family and Other Animals by Durrell, Gerald , Paperback $4.20 Sponges, Jellyfish, and Other Simple Animals (Animal Kingdom Classification)Sponges, Jellyfish, and Other Simple Animals (Animal Kingdom Classification) $4.34
Peter Rabbit and Eleven Other Favorite Tales [Dover Children's Thrift Classics]Peter Rabbit and Eleven Other Favorite Tales [Dover Children's Thrift Classics] $3.65 Pandas and Other Endangered Species: A- 0375870253, Mary Pope Osborne, paperbackPandas and Other Endangered Species: A- 0375870253, Mary Pope Osborne, paperback $3.58
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My Family and Other Animals by Durrell, Gerald Hardback Book The Fast FreeMy Family and Other Animals by Durrell, Gerald Hardback Book The Fast Free $19.39 Animals on the Other Side by Browne, Sylvia , HardcoverAnimals on the Other Side by Browne, Sylvia , Hardcover $4.20
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The Gap: The Science of What Separates Us from Other AnimalsThe Gap: The Science of What Separates Us from Other Animals $4.09 Straw Dogs : Thoughts on Humans and Other Animals by John Gray (2007) PaperbackStraw Dogs : Thoughts on Humans and Other Animals by John Gray (2007) Paperback $8.00
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Prices current as of last update, 08/10/22 10:57am.

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