08/July/2010 Sharks have been in existence for more than 300 million years. Their evolution occurred over 150 million years earlier than that of the dinosaurs. Most of the existing fossil data of early sharks was collected from fossilized teeth together with several skin impressions. primitive sharks (Cladodonts) ‚ had teeth which were double-pointed‚ up to 2metres in length‚ ate fish as well as crustaceans‚ and existed approximately 360 million years ago. The earliest shark-like beings shown
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Sharks belong to a group of fish called Chondrichthyes. Meaning they have skeletons made of cartilage instead of bones. These marine animals have inhabited the oceans for almost 440 million years. Hundreds of millions of years before humanity was ever created. While the idea of dinosaurs dominates the idea of a prehistoric world‚ they weren’t alive until about 230 million years ago. This has allowed for these cartilaginous sharks to evolve over time into the creatures that we are accustomed to today
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Bull sharks‚ these incredible organism’s have undergone very interesting evolution’s as they evolved from the requiem shark. I will be writing this essay about the amazing evolution of the bull shark and it ancestor‚ how long they’ve been around. Any other related organisms‚ and the most relevant information about this amazing creature. Trust me when i say inspiration when i’m talking about this animal. The bull shark has inspired many video game developers in making their own version of the creature
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Sharks Sharks are one of the most feared carnivores in the sea. There are 365 species of of sharks in the sea as we know today. All sharks are carnivores. Most of them eat live fish‚ including other sharks. A shark’s most common natural enemy is an another shark. Most sharks eat their prey whole‚ or they tear off large chunks of the bodies. Some sharks crush their prey. Others take out small pieces off flesh from large fish. Sharks also feed on dead or dying animals. Sharks have the reputation of
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Why is it important to save the sharks? The shark is an apex predator of the marine ecosystem. In the marine ecosystem these predators are placed at the top of the food chain. Apex predators have a vital role in maintaining the health and balance of the ecosystems they dwell in. In addition to the previous statement if these top of the food chain predators were to be removed from their ecosystems‚ the health and balance of these ecosystems would become shattered and disturbed‚ with nobody to maintain
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New hybrid sharks discovered: Signs of global warming? January 3‚ 2012 In what is being hailed as the world’s first evidence of inter-species breeding among sharks‚ a team of marine researchers at the University of Queensland have identified 57 hybrid sharks in waters off Australia’s east coast. The new sharks possess genetic material from both the Australian blacktip shark (Carcharhinus tilstoni) and the common blacktip shark (Carcharhinus limbatus). The Australian blacktip is smaller and tends
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_______________________ Great White Sharks by Erin Ryan The great white shark is one of the most recognizable sharks in the world. The only shark larger than a great white is the whale shark. Great white sharks have been found in each of the world’s oceans. Even though they have been spotted in waters as shallow as three feet (one meter) deep‚ these sharks spend most of their time in deep coastal waters. The great white shark is related to the prehistoric Megalodon shark‚ which grew to over sixty-five
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Sharks myths busted We cannot run away from the fact that Sharks have been stereotyped to being these big and dangerous species that are feared by all humans. This species has been misrepresented in movies to be one of the most feared species in the ocean. We’re busting some shark myths that have been going on forever. MYTH 1: Sharks are man-eaters A negative perception of sharks is that they see humans as food which is not a fact. Most sharks prey on fish or invertebrates. It is said that sharks
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Sharks Many people often admire sharks and think they are awesome creatures‚ but they do not know if it would matter if sharks disappeared from the ocean. The answer to this question is yes‚ sharks are a very vital aspect to the ocean. Sharks are so important because they balance the ocean’s ecosystem. All organisms in the ecosystem are dependent upon one another to maintain a balance. If sharks disappeared‚ so would this community in
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Bull Shark: Osmoregulator Predator Scott Marshall English Composition: EN-101-15 Professor Craig Cushing April 19‚ 2010 Outline Thesis Sentence: Carcharhinus leucas also known as Bull Shark are unlike other sharks as they can tolerate fresh water and can travel far upstream in rivers. I. Introduction A. Definition of Carcharhinus leucas‚ its class‚ subclass and physiology B. Eytmology. II. Common Names III. Habitat IV. Eating habits V. Adaptability; osmoregulation
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