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Sharks have been around since the dinosaurs, and haven't really changed too much. Sharks are a type of fish that have a skeleton made up of cartilage. Cartilage is a tough, connective tissue. It isn't as tough as bone, but it isn't as flexible as muscle either.
Humans have cartilage present in their ears and the tip of their noses. Sharks also lack a swim bladder, unlike other bony fish. Unlike bony fish, they tend to have sandpapery skin, made up of tiny teeth "dermal denticles". Sharks are present in all types of water fresh, brackish or salt water and are found in all oceans including the really cold ones! Skates and rays are flattened cartilaginous fish that are closely related to sharks.
Skates belong to one scientific order Rajiformes while rays are classified in three scientific orders Pristiformes , Myliobatiformes , and Torpediniformes. It's really hard to tell skates and rays apart. However there are a few differences: Rays tend to be larger than skates. Rays are live bearing viviparous and skates lay eggs oviparous.
Skates tend to have some sort of dorsal fin. Stingrays have a spine on their tails, while skates do not. Chimaeras are cartilaginous fish commonly known as, "ghost sharks , " rat fish," "spookfish" or "rabbit fish. Like sharks, they use electroreception to find their food. They also have internal fertilization and lay eggs in tough, leathery cases. They live in deep waters, though some species will be found in shallow waters.
Chimaeras have smooth skin with large placoid scales, and tend to be dark colored. Los tiburones han existido desde el tiempo de los dinosaurios y no han cambiado mucho desde entonces. Las rayas tipo "skates" tienden a tener un tipo de aleta dorsal. Viven en las profundidades aunque algunas especies habitan en aguas poco profundas. Las quimeras tienen piel suave con grandes placas escamosas, y suelen ser de colores oscuros.
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Sharks have been around since the dinosaurs, and haven't really changed too much. Sharks are a type of fish that have a skeleton made up of cartilage. Cartilage is a tough, connective tissue. It isn't as tough as bone, but it isn't as flexible as muscle either. Humans have cartilage present in their ears and the tip of their noses. Sharks also lack a swim bladder, unlike other bony fish.
Peces oseos y cartilaginosos: Aprende cuales son y más
are you familiar with the
Reproducción de peces cartilaginosos. Una revisión de algunas adaptaciones reproductivas