The theory of evolution‚ formalized by Charles Darwin‚ is as much theory as is the theory of gravity‚ or the theory of relativity. Unlike theories of physics‚ biological theories‚ and especially evolution‚ have been argued long and hard in socio-political arenas. Even today‚ evolution is not often taught in primary schools. However‚ evolution is the binding force of all biological research. It is the unifying theme. In paleontology‚ evolution gives workers a powerful way to organize the remains of
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Evolution of Polar Bears The observed fossil transitions that inform our knowledge of Polar Bear speciation are very well documented. Bear fossils change through time: generally‚ when examining the fossil record‚ successively deeper levels of sediments or sedimentary rocks yield successively older fossils. For some transitions from one species to another‚ one can find a well-characterized series of transitional specimens leading the observer across the species "boundaries" (Kurten‚ 1976). Sometime
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relationship with those of America‚ though separated from that continent by an open space of ocean‚ between 500 and 600 miles in width." At this early stage of his life‚ along with graduating college Darwin soon began collecting evidence for his theory of Evolution and natural selection. While on his journey Darwin made many observations. They were mainly about the different species he saw on the Galapagos Islands. Each island had a different variation of birds. He noticed that the beak sizes of the
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Human Disease Several scientific terms are relatively easy to define‚ others tend to be more difficult; “health” and “disease” fall under the latter category. Many suggest that “disease” is merely a disorder of a system’s normal functions while “health” is the absence of disease. On the other hand‚ could a person whose bodily systems are functioning properly but who is unhappy or depressed be considered healthy? Can an alcoholic or drug-addict whose habit has not as yet caused any physical harm
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Evolution in biology is a genetic change in a line of descent over time. The evolution of life on Earth has resulted in many hundreds of thousands of species. Genetic evidence reveals that humans share a common ancestor with life forms as different from us as bacteria and corn plants. In early 1800s‚ the source of Earth’s remarkable diversity of life forms was hotly disputed. Many people believed that all species had come into existence at the same time in the distant past. In 1831 Charles Darwin
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Anemia is not a disease‚ but a sign that the body has some sort of problem with its red blood cells (RBCs). If a person’s blood does not have the right amount of red blood cells or hemoglobin‚ anemia can develop. Anemia is defined as a decrease in the circulating red blood cell mass and an equal decrease in the oxygen carrying capacity of the blood (also known as hemoglobin). There are many types of anemia that are grouped by their underlying cause. To determine which type‚ doctors describe color
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Gaston Havandjian Proffesor Hubbell English Comp I Essay Two 10/09/12 Evolution Did you know that in this exact moment people are being born without wisdom teeth? Probably after reading this you are thinking about how great will it be for these lucky ones not experiencing the pain you had to go through when those wise bones were growing out or the anxiety you felt the day the surgeon removed them for good. You also might be asking yourself a question: Why this is happening? The answer can
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Hirschsprung’s Disease Hirschsprung’s Disease was named after Harold Hirschsprung‚ a Danish physician‚ in 1886. It is a congenital disorder which means it is present at birth. It is an enlargement of the colon where ganglion cells‚ or nerve cells‚ are not present. This results in improper movement of the muscles in the bowel causing chronic constipation. The only certain method of diagnosis is a rectal biopsy. We will explore the symptoms‚ causes‚ and treatments of this disease. The severity
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a.1 Eukaryotic Cell vs Prokaryotic Cell All cells can be classfied into prokaryotes and eukaryotes. Prokaryotes were the only form of life on Earth for millions of years until more complicated eukaryotic cells came into being through the process of evolution. Comparison chart All attributes Differences Similarities | Eukaryotic Cell | Prokaryotic Cell | Nucleus: | Present | Absent | Number of chromosomes: | More than one | One--but not true chromosome: Plasmids | Cell Type: | Multicellular
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The cell is the fundamental structural unit of all living organisms. Some cells are complete organisms‚ such as the unicellular bacteria and protozoa; others‚ such as nerve‚ liver‚ and muscle cells‚ are specialized components of multi-cellular organisms. Cells range in size from the smallest bacteria-like mycoplasmas‚ which are 0.1 micrometer in diameter‚ to the egg yolks of ostriches‚ which are about 8 cm (about 3 in) in diameter. Although they may differ widely in appearance and function‚ all cells
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