Gertsen Skin Evolution Essay Human skin pigmentation is the product of two clines produced by natural selection to adjust levels of constitutive pigmentation to levels of UV radiation (UVR). One cline was generated by high UVR near the equator and led to the evolution of dark‚ photo protective‚ melanin-rich pigmentation. The other was produced by the requirement for UVB photons to sustain cutaneous photosynthesis of vitamin D3 in low-UVB environments‚ and resulted in the evolution of pigmented skin
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of menopause have been selected for because grandmothers significantly improve grand offspring survival probabilities.’ (J. Beise) These two hypotheses have biological origins but have social implications; they are both tested for evolution of menopause and the evolution of post-generative longevity. Menopause and post-generative longevity are artefacts of modern life that were not present for most human evolutionary history‚ and are in accordance
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building remains standing. Architects need to design structures that hold up under any combination of three physical forces; compression‚ tension‚ and bending. To days architects have a plethora of materials at their disposal‚ they benefit from the evolution of materials and have the opportunity to use them how they wish‚ but it has not always been this way. Primitive buildings were built using dry masonry‚ which is a simple technique of stacking stones in a consistent pattern without using any mortar
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science vs. religion there has been no issues more hotly debated than that of evolution vs. creationism. The issue is passionately debated since the majority of evidence is in favor of evolution‚ but the creation point of view can never be proved wrong because of long standing religious beliefs. Human creation is seperated into three simple beliefs; creation theory‚ naturalistic evolution theory‚ and theistic evolution theory. The complexities of all three sides create a difficult dilemma for what
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INTRODUCTION - THE EVOLUTION OF MANAGEMENT THEORY During the industrial revolution that took place in Western Europe and North America in the 18th century; various machines were built and the economy which was based on manual labor was replaced by machines. Then factories of large scale in the garment sector‚ automobile sector etc emerged rapidly and the need to increase organizational efficiency and effectiveness has guided the evolution of management theory till today. Managers‚ theorists‚ researcher
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on Science Skeletons Reveal Human and Chimpanzee Evolution Student Worksheet About This Worksheet This worksheet complements the Click and Learn “Skeletons Reveal Human and Chimpanzee Evolution” developed in conjunction with the 2011 Holiday Lectures on Science‚ “Bones‚ Stones‚ and Genes: The Origin of Modern Humans”. Author: Mark Eberhard‚ St. Clair High School Web Link: www.hhmi.org/biointeractive/skeletons-reveal-human-and-chimpanzee-evolution Click the arrow in the bottom right corner of the
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Running Head: Evolution of Private Security Evolution of Private Security Zachary Cuonzo Kaplan University CJ210-04 Professor Preston March 16‚ 2011 The end of the Second World War saw an increase in the awareness of individual rights such as the right to be protected from harm at all costs. Though the demand for private security arose in ancient times‚ the Second World War heightened its demand and saw the evolution of private security practice boom into a multibillion industry all over
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The evolution of Russian Ballet Marilyn Monroe once said‚ “Give a girl the right shoes‚ and she can conquer the world” and I believe she was right and referring to ballet slippers when she said this. The Russian Ballet has been around for ages now and it has had quite a delightful evolution within. Ballet was introduced into Russia by Tsar Alexis Mikhailovich during the 17th century. By this time Tsar Alexis Mikhailovich was the second ruler of Russia‚ he reigned from 1645-1676. Ballet was introduced
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were probably the first modern-day cats to develop and evolve‚ scientists and researchers need to know how they developed so they can better understand how small cats like housecats evolved. Fossil evidence is very important in figuring out the evolution of cats over time. Moreover‚ humans loved the little‚ soft‚ furry cats‚ so they took them into their homes. Lusted writes‚ “Cats probably domesticated themselves: people wanted them‚ and so they fed them‚ and cats gradually grew used to people and
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Evolution of Music Genres (Hip-Hop/R&B) Music is truly a gift to humanity that can be used in a multitude of ways. Music is used in ways of conveying emotion and creativity; it can also be used in celebration or setting the mood for a certain event. Whether music fans notice or not‚ the evolution of music is occurring now. Certain music genres have been thrusted into the limelight of the current state of music and also the future of it as well. The first new genre that has emerged from the pack
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