Animal Extinction - the greatest threat to mankind In the final stages of dehydration the body shrinks‚ robbing youth from the young as the skin puckers‚ eyes recede into orbits‚ and the tongue swells and cracks. Brain cells shrivel and muscles seize. The kidneys shut down. Blood volume drops‚ triggering hypovolemic shock‚ with its attendant respiratory and cardiac failures. These combined assaults disrupt the chemical and electrical pathways of the body until all systems cascade toward death.
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Bears 1. Bears are large animals with thick‚ strong legs. Bears have big heads‚ little eyes and small round ears. All bears are covered with heavy fur. 2. Bears can see and hear like us. Bears have a very good sense of smell. Bears can stand on their hind legs to smell and see better. Bears are smart and curious animals. 3. There are 8 different kinds of bears - brown bears‚ American black bears‚ polar bears‚ giant panda bears‚ Asiatic black bears
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APES Humans’ Affect on Extinction If extinction is a natural part of the world‚ why should we worry about it? Speciation results in new species filling the ecological niche of extinct species. Why should we care if we speed up this process? Biologists say there are four main reasons to care about extinctions. First‚ the world’s species are a vital part of the earth’s life support system. A second reason is that species usually contribute to economic services. The third reason is that it takes
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In biology and ecology‚ extinction is the end of an organism or of a group of organisms (taxon)‚ normally a species. The moment of extinction is generally considered to be the death of the last individual of the species‚ although the capacity to breed and recover may have been lost before this point. Because a species’ potential range may be very large‚ determining this moment is difficult‚ and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa‚ where a species
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Extinction of Dinosaurs Two-hundred and thirty million years ago the first dinosaur-like creature roamed the earth. Dinosaurs were a very successful and diverse group‚ dominating the terrestrial environments of the earth for 160 million years. The apparently sudden mass extinction of dinosaurs marks the boundary between the Cretaceous and Tertiary periods. Though there is not one definitive explanation to explain dinosaurs’ extinction‚ there are various theories that attempt to account for the
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English 101 March 01‚ 2013 Polar Opposites When my twins were infants it was much easier for everyone to acknowledge them as twins. A big clue was the double stroller. There was never a question if they were twins as long as I had that linking stroller nearby. But as they grew out of the strollers they grew into themselves. Now that they are six years old nobody would suspect them of being twins. They are complete opposites. I often joke to others that if I sent someone into a room
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forcing unprecedented numbers of species toward extinction. However‚ extinction is a natural biological process that has been a part of species’ evolution since the beginning of time. Fossil records have shown that‚ even before humans were a part of the world’s biota‚ natural factors such as overspecialization ‚ competition‚ sudden climatic change‚ or catastrophic events like volcanic eruptions and earthquakes have driven species to endangerment and extinction. Some people may ask "why bother with
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Extinction of Dinosaurs Ryan Humphries Biology 6th Period Two-hundred and thirty million years ago the first dinosaur-like creature roamed the earth. Within five million years it could be considered a dinosaur. They were soon at the top of the food chain. They populated every continent. Then 65 million years ago they vanished. The most powerful creatures ever to live on earth had become extinct. Dinosaurs were not the only victims of this "mass extinction." There were many other species
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Extinction is the ceasing of a species to exist on this Earth. A species officially becomes extinct when all of the species no longer exists. A species is to become certainly extinct when there is an extremely small number of it and it is unable to reproduce to create more of itself. Therefore‚ we say a species is in for certain extinction if it cannot reproduce itself. Extinctions occur at a great pace and species that we did not even know existed become extinct all the time. Scientists say that
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pterosaurs‚ ammonites‚ and many families of brachiopods and sea sponges. Also‚ many shark species as well as most vegetation did not survive(“Dinosaur Extinction”). What could have possibly killed off the dominant animal group of the time? The answer to this question is still unclear but there are many hypotheses that attempt to explain this extinction event. To find out exactly how this happened‚ evidence must be gathered not only from fossils
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