Excuse me waiter, there’s a shark in my soup
Some 200m years before dinosaurs made their appearance on earth and thus quite some time before Homo sapiens began celebrating nuptials at extravagant wedding banquets, sharks swam the oceans. Sharks are older than trees. They have survived at least four planetary mass extinctions. 在恐龙在地球上出现之前两亿年左右,也就是在现代人(Homo sapiens)开始举办奢华婚宴之前相当久远的时候,鲨鱼们就已经在海洋中游弋。鲨鱼比树还要古老。它们至少经历了四次地球物种灭绝,一直活到了今天。
The link between these ancient predators and contem谢谢,请采纳!
Sharks (superorder Selachimorpha) are fish with a full cartilaginous skeleton[1] and a streamlined body. They respire with the use of five to seven gill slits. Sharks have a covering of dermal denticles to protect their skin from damage and parasites and to improve fluid dynamics.[1] They have replaceable teeth. They are some of the world's most misunderstood predators, as they very rarely attack humans unless intimidated.
Sharks (superorder Selachimorpha) are fish with a full cartilaginous skeleton[1] and a streamlined body. They respire with the use of five to seven gill slits. Sharks have a covering of dermal denticles to protect their skin from damage and parasites and to improve fluid dynamics.[1] They have replaceable teeth. They are some of the world's most misunderstood predators, as they very rarely attack humans unless intimidated.
Sharks include species from the hand-sized pygmy shark, Euprotomicrus bispinatus, a deep sea species of only 22 centimetres (9 inches) in length, to the whale shark, Rhincodon typus, the largest fish, which grows to a length of approximately 12 metres (41 feet) and which, like the great whales, feeds only on plankton through filter feeding. The bull shark, Carcharhinus leucas, is the best known of several species to swim in both salt and fresh water (it is found in Lake Nicaragua, in Central America) and in deltas.[2]