do you know why the second one is named as 'blue'?
The top of the body is deep blue, lighter on the sides, and the underside is white.
Blue shark
 the top of the body is deep blue, lighter on the sides, and the underside is white.
please tell me more about jaekelopterus It is a genus of predatory eurypterid, a group of extinct aquatic arthropods. is their species still alive? UNANSWERABLE where can they be found? It lived in non-marine aquatic environments. you mentioned that these were predators, what more can you tell me about them as predators? Fully grown "Jaekelopterus" would have been apex predators in their environments and likely preyed upon smaller arthropods (including resorting to cannibalism) and early vertebrates. you mean they ate each other, but what would be the benefit? UNANSWERABLE what harm can come by eating each other? It has been shown in some studies that the risk of encountering an infected victim increases when there is a higher cannibalism rate. do you know any other species that eats each other? Aquatic ecosystems please tell me more about this Communities of organisms that are dependent on each other and on their environment live in aquatic ecosystems. can you please name a few of these organisms Whales, sharks, and tuna live etc can you please describe the first one to me UNANSWERABLE can you please describe the second one to me They are 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. what are their different types? Tiger shark, blue shark, great white shark, mako shark, thresher shark, and hammerhead shark what more can you tell me about the first one? It is a large macropredator, capable of attaining a length over. is there any reason why it is referred to as 'tiger'? Its name derives from the dark stripes down its body, which resemble a tiger's pattern.
wiki:11688817
Blue shark [SEP] Anatomy and appearance
Blue sharks are light-bodied with long pectoral fins. Like many other sharks, blue sharks are countershaded: the top of the body is deep blue, lighter on the sides, and the underside is white. The male blue shark commonly grows to at maturity, whereas the larger females commonly grow to at maturity. Large specimens can grow to long. Occasionally, an outsized blue shark is reported, with one widely printed claim of a length of , but no shark even approaching this size has been scientifically documented. The blue shark is fairly elongated and slender in build and typically weighs from in males and from in large females.