What is the most ancient group of vertebrates? After the movie Jaws came out some people began hunting Great White sharks and killing them because people felt they were dangerous. Lastly, most of them have scales for protection. Cartilage is comprised of cells called chondrocytes, which create the cartilaginous material in our bodies that is rich in protein and elastin fibers. Cartilage is not as flexible as our muscles are, and it isn’t as rigid as our bones, yet it is crucial in human anatomy. 3. What type of body covering do birds have? Instead, stingrays are cartilaginous, much like sharks. Earn Transferable Credit & Get your Degree, Get access to this video and our entire Q&A library. All other trademarks and copyrights are the property of their respective owners. What is very interesting about Hammerheads is that they swim in schools with other Hammerheads, whereas other sharks are very solitary and independent. Habitat Rays spend most of their time in shallow, temperate waters within a few yards of the shore. You should be afraid if you are in the ocean and don’t see sharks.” — Sylvia Earl. We provoke a shark every time we enter the water where sharks happen to be, for we forget: The ocean is not our territory – it’s theirs. - Definition, Scope & History, Class Osteichthyes: Characteristics & Examples, Phylum Echinodermata: Definition, Characteristics & Examples, Characteristics of Arthropods Lesson for Kids, Phylum Annelida: Characteristics, Classes & Examples, What is an Amphibian? This species closely resembles lifeforms seen millions of years ago and is regarded as an ancient animal. To me, one of the coolest things about a shark’s anatomy is that their jaw isn’t connected to their skull. Copyright © 2020 Multiply Media, LLC. There are over 220 species of stingrays known to scientists. How much caffeine can you drink if you are pregnant? We cover everything from solar power cell technology to climate change to cancer research. Contrast invertebrates with vertebrates. Sharks typically have 8 fins that help them maneuver and swim. Obviously, this wasn’t an intended consequence but it did still happen. These guys are pretty unique as they have no bones in their body – their skeleton is made up of flexible cartilage (the bendy stuff that your ears and nose are made from!). Which of the following is a Class? - Definition, Characteristics & Anatomy, Gymnosperms: Characteristics, Definition & Types, Major Animal Phyla & Their Characteristics, Prentice Hall Earth Science: Online Textbook Help, UExcel Anatomy & Physiology: Study Guide & Test Prep, Certified Nutrition Specialist (CNS): Test Prep & Study Guide, CSET Science Subtest II Life Sciences (217): Practice & Study Guide, Prentice Hall Biology: Online Textbook Help, Holt Physical Science: Online Textbook Help, High School Physical Science: Homework Help Resource, CSET Science Subtest II Chemistry (218): Practice & Study Guide, Biological and Biomedical Services, Vertebrates: Definition, Features & Classification, Working Scholars® Bringing Tuition-Free College to the Community. Well, check out this guide to learn about sharks and if they have bones. Most sharks only have one row of these tesserae blocks, but bigger species of sharks can have up to five layers.