The 50,000 species of living vertebrates are placed in nine classes: hagfish, lampreys, cartilaginous fish, ray-finned fish, lobe-finned fish, amphibians, reptiles, birds, and mammals.Classes are listed in order of evolution. Table below lists some of the distinguishing traits of each class. excretes urea that is needed for the shark to have in its system so the shark does. These complex animals vary in size from less than 0.4 in (1 cm) to over. Snakes’ long backbones (spines) are made up of many individual vertebrae. Shark anatomy differs from that of bony fish in a variety of ways. All vertebrates have an inner skeleton, including a skull, backbone, and ribs. All snakes are vertebrates, and therefore all snakes have a backbone, the size of a snakes’ spine is dependent on the size of the snake. The other classes are amphibians, reptiles, birds, and mammals. Generally, the critical distinction between vertebrates and invertebrates is that vertebrates have a backbone (spine), whereas invertebrates do not. There are about 50,000 vertebrate species, and they are placed in nine different classes. Goblin Sharks have a total length between 5’-12.5’ (1.5-3.8 m) and an overall weight in the. They have a protruding jaw with sharp tiny teeth that are arranged in multiple rows and a long and flat snout that resembles a sword blade. Plus, cartilage is very flexible when compared to bone, allowing sharks to swim faster and turn tighter, perfect for chasing down their prey. The Goblin Shark (Mitsukurina Owstoni) is a species of shark that is often referred to as a living fossil as their ancestry can be traced back extensively. If sharks had regular bones in their skeleton, they'd be much heavier. A shark's skeleton is different because it is cartilage instead of bone, but sharks do have spines.No sharks do not have a backbone. FUN FACT: Bottom-dwelling sharks typically have more oils in their livers, allowing them to float easily. Stingray are cartilaginous fish, related to sharks. All fish are vertebrates and they have backbones. Each of the five classes has distinguishing characteristics that allow members to be classified appropriately. Making them one of the most agile animals in the ocean. The flexibility of cartilage also allows them to make tight turns quickly. This spinal column protects the sharks spinal cord similar to the way a bone spinal column would. Sharks have a unique spinal column that attaches to the rest of their cartilaginous skeleton and is made of cartilage. Being lighter helps a shark to stay afloat and reduces the amount of energy they need to move about. How do sharks have backbones if they dont have bones The thing is, animals dont need to have backbones for them to classify as vertebrates. However, the backbone of a shark is not really made of bone. This is strong and durable, yet much more flexible and lighter than bone. But what type? Of the nine classes of vertebrates, five are fish. Tiger sharks are a type of vertebrate animal.
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