Web2 days ago · Noun []. shark (plural sharks) (ichthyology) A scaleless, predatory fish of the superorder Selachimorpha, with a cartilaginous skeleton and 5 to 7 gill slits on each side of its head.1569, The true discripcion of this marueilous straunge Fishe, whiche was taken on Thursday was sennight, the xvi. day of June, this present month, in the yeare of our Lord … WebThe oceanic whitetip, porbeagle and three hammerhead species are some of the shark species of concern for WWF, where the impact of trade is contributing to declines in populations. Millions of these sharks continue …
Shark - Definition, Meaning & Synonyms Vocabulary.com
WebThe process of collecting the fins routinely requires that the fins are hacked off the still living animal. The shark is then tossed back into the ocean where, unable to swim, it … WebMar 16, 2024 · The largest among the more predatory species is the voracious 6-metre (20-foot) white shark, which attacks seals, dolphins, sea turtles, large fish, and occasionally … care homes marlow
shark - Kids Britannica Kids Homework Help
Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the … See more Until the 16th century, sharks were known to mariners as "sea dogs". This is still evidential in several species termed "dogfish," or the porbeagle. The etymology of the word shark is uncertain, the most … See more Teeth Shark teeth are embedded in the gums rather than directly affixed to the jaw, and are constantly replaced throughout life. Multiple rows of … See more Buoyancy Unlike bony fish, sharks do not have gas-filled swim bladders for buoyancy. Instead, sharks rely on a large liver filled with oil that contains See more The classic view describes a solitary hunter, ranging the oceans in search of food. However, this applies to only a few species. Most live … See more Fossil record The oldest total-group chondrichthyans, known as acanthodians or "spiny sharks", appeared during … See more Smell Sharks have keen olfactory senses, located in the short duct (which is not fused, unlike bony fish) between … See more Shark lifespans vary by species. Most live 20 to 30 years. The spiny dogfish has one of the longest lifespans at more than 100 years. Whale sharks (Rhincodon typus) may also live over … See more WebMar 16, 2024 · chondrichthyan, (class Chondrichthyes), also called chondrichthian, any member of the diverse group of cartilaginous fishes that includes the sharks, skates, rays, and chimaeras. The class is one of … WebNov 1, 2024 · Dolphins and sharks separately evolved very similar physical features that have helped them become successful marine predators. (Image credit: Shutterstock) Convergent evolution is when different ... care homes marlborough wiltshire