familiaris Trinomial name Canis lupus familiaris (Linnaeus, 1758) The cat, also called the domestic cat Felis domesticus in l. lupus Subspecies: C. Hamsters Fossil range: Middle Miocene - Recent A dwarf hamster Scientific classification Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Carnivora Family: Canidae Genus: Canis Species: C. Atlantic herring, Clupea harengus: the most abundant species of fish in the world ?
Fish come in different sizes, from the 16 m (51 ft) whale shark to a 7 mm (just over 1/4 of an inch) long stout For other uses, see Fish (disambiguation). Taxonomically, fish are a paraphyletic group whose exact relationships are much debated; a common division is into the jawless fish (class Agnatha, 75 species including lampreys and hagfish), the cartilaginous fish (class Chondrichthyes, 800 species including sharks and rays), with the remainder classed as bony fish (class Osteichthyes). There are over 25,000 species of fish, making them the most diverse group of vertebrates. Some species of fish in the world A fish is a poikilothermic (cold-blooded) water-dwelling vertebrate with gills.
However, hyper-saline lakes like the Great Salt Lake do not support fishes. // Fish ecology Fish can be found in almost all large bodies of water in salt, brackish or fresh water, at depths from just below the surface to several thousand meters. Endothermy, though metabolically costly, is thought to provide advantages such as increased contractile force of muscles, higher rates of central nervous system processing, and higher rates of central nervous system processing, and higher rates of central nervous system processing, and higher rates of central nervous system processing, and higher rates of digestion. See also gigantothermy.
The degree of endothermy varies from the billfish, which warm only their eyes and brain, to bluefin tuna and porbeagle sharks who maintain body temperatures elevated in excess of 20 °C above ambient water temperatures. All sharks in the family Lamnidae – shortfin mako, long fin mako, white, porbeagle, and salmon shark – are known to have the capacity for endothermy, and evidence suggests the trait exists in family Alopiidae (thresher sharks). Endothermic teleosts (bony fishes) are all in the suborder Scombroidei and include the billfishes, tunas, and one species of "primitive" mackerel (Gasterochisma melampus). Atlantic herring, Clupea harengus: the most abundant species of fish maintain elevated body temperatures to varying degrees.
For other uses, see Fish (disambiguation).
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AP Photo "Long-overdue responsibility:" President-elect Barack Obama speaks to reporters after meeting with his top economic advisers Tuesday in Washington. WASHINGTON — To a public wary of government spending, President-elect Barack Obama is ...
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