Join. No. Yes, thankfully. I was just wondering if some sharks have a placenta or some connection between the mother and the developing young. A new species of shark, skate or ray is identified approximately every two weeks. 5. ... yes they do. Yes, some sharks need to swim continuously to stay alive. One of … Do sharks have bones? We all need to learn to control it, the tongue. Many young sharks spend their first few months or years in the safety of a nursery until they’ve grown big enough to venture out into the open sea. Some sharks need to hunt in … Megalodon young may have done the same. Answer Save. Removed comment. Do sharks have placentas? Once it is out there, is no taking it back. Sharks are fascinating creatures, especially when it comes to discussing their reproduction and development. Trending questions. Some sharks also have a mechanism on their caudal fins called a horizontal keel, which reduces turbulence and allows them to swim faster. - Credit: Marc Baldwin. It seems that these molluscs use their drill-like radula (tongue) to bore into the eggcase and feed on the energy-rich yolk. Scientists have found out the true size of the prehistoric giant shark, Megalodon. Sharks obtain oxygen for breathing from the water that flows over their gills. 0 0. This has caused many species of sharks to become vulnerable to endangerment. 0. Shark Senses. Sharks are apex predators that have no natural enemies; however, humans are predators of sharks, with an estimated 30 to 100 million sharks are killed every year by fisherman. Many shark species have brains as complex as mammals, which enables them to process a wide range of senses. Join Yahoo Answers and get 100 points today. Sharks belong to the elasmobranch group of fish that have lighter, more flexible cartilage in their skeleton, instead of bone. Known as a mermaid’s purse, the egg sac of oviparous sharks … It's integral to wildlife conservation, providing the bedrock for our understanding of sharks. If they stop swimming, no more water flow means no more oxygen, so breathing stops. Sharks are divided into two groups: those that lay eggs (oviparous), and those that give live birth (viviparous). True sharks are classified in the superorder selachimorpha and there are more than 440 species alive today. What the large upper lobe does for the shark is to ensure a combination of being able to cruise at slow speeds, observing their surrounds and scouting for prey, and suddenly to burst into a powerful surge when in pursuit of darting prey. James 3:5-7 (NKJV) 5 Even so the tongue is a little member and boasts great things. Do sharks have any predators/threats? So don't leave the tank and let your sharks collude behind your back! Get answers by asking now. See how great a forest a little fire kindles! ... Do sharks have tongues? 6 And the tongue is a fire, a world of [unrighteousness]iniquity. P. Instead have a yes or no answer ready for any potential combination of offers from the sharks… However some bottom-dwelling sharks have adaptations for breathing even while they are still on the sea floor. Shark eggs are telolecithal and this concentration of yolk means they represent an attractive source of fats and protein to potential predators. Ask question + 100. Taxonomy is a field of science that involves classifying and naming species. Still have questions? 3 Answers. The tongue is amazing when it comes to running. 1 Corinthians 12:9 to another faith by the same Spirit, to another gifts of healing by that one Spirit, 1 Corinthians 12:10 to another the working of miracles, to another prophecy, to another distinguishing between spirits, to another speaking in various tongues, and to still another the interpretation of tongues. On their caudal fins called a horizontal keel, which reduces turbulence and allows them to continuously. 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