Sea nettles

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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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BirdsBirds
CatsCats
DogsDogs
FerretsFerrets
FishFish
Guinea PigsGuinea Pigs
HorsesHorses
Other AnimalsOther Animals
RabbitsRabbits
ReptilesReptiles
RodentsRodents
Sugar GlidersSugar Gliders
Tadpoles & FrogsTadpoles & Frogs
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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4 Chem Dry Professional Strength Spot Remover World Famous Concentrated4 Chem Dry Professional Strength Spot Remover World Famous Concentrated $56.76 Boots & Barkley Pet Food, Treat, and Toy Storage Bag 17" x 9", Teal Please ReadBoots & Barkley Pet Food, Treat, and Toy Storage Bag 17" x 9", Teal Please Read $11.99
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Core Power by fairlife Elite High Protein (42g) Milk Shake, Vanilla, 14 fl ozCore Power by fairlife Elite High Protein (42g) Milk Shake, Vanilla, 14 fl oz $140.04 bitchy sister she’s free and u can also take anouther is u buy within 24 hours!bitchy sister she’s free and u can also take anouther is u buy within 24 hours! $0.99
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Pain Relief Lotion for Dogs and Cats - Miracle CarePain Relief Lotion for Dogs and Cats - Miracle Care $8.50 Scoops Litter Processor Toilet Pet Scoop Cat Spoon Litter Litter Litter ScoopsScoops Litter Processor Toilet Pet Scoop Cat Spoon Litter Litter Litter Scoops $13.19 to $13.49
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Acrylic Ant Nest Farm Educational Formicarium Ant Nest for Ant Colony LivingAcrylic Ant Nest Farm Educational Formicarium Ant Nest for Ant Colony Living $24.93 Kreg Kma2700 Accu-Cut 48-Inch Guide Track System With Kma2685 Rip-Cut 24-Inch PrKreg Kma2700 Accu-Cut 48-Inch Guide Track System With Kma2685 Rip-Cut 24-Inch Pr $103.85 to $155.11
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Hot Spot Lotion for Dogs - Miracle CareHot Spot Lotion for Dogs - Miracle Care $10.95 Greedy Steed 4cm Hole Slowfeed Hay NetGreedy Steed 4cm Hole Slowfeed Hay Net $17.23 to $37.34
9.5 Inches Dog Tennis Ball Giant Pet Toys for Toy Ball For Dog Training Supplies9.5 Inches Dog Tennis Ball Giant Pet Toys for Toy Ball For Dog Training Supplies $11.66 Bestop 52507-01 Black Crush Traditional Bikini Top for 1976-1983 Cj-5Bestop 52507-01 Black Crush Traditional Bikini Top for 1976-1983 Cj-5 $69.18
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Demon 2015 Complete Tune Personal Kit for Snowboard Ski + Free Gift Temp WaxDemon 2015 Complete Tune Personal Kit for Snowboard Ski + Free Gift Temp Wax $71.80 Trending at $75.93 Mighty Morphin Power Rangers Pet Dog CollarMighty Morphin Power Rangers Pet Dog Collar $6.00
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Prices current as of last update, 04/18/19 12:27pm.

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