Evolution of the craniate middle ear The evolution of the auditory structures of the middle ear began with the recycling of the second gill arches in primitive fish (Braxeau and Jeffery 2008). While the first set of gill arches became the upper and lower jaws‚ the upper portion of the second gill arch‚ the hyoid arch‚ became a support structure for the cranium as the hyomandibula (Manley 2010). Examinations of Sarcopterygiian fishes such as Rhipidistians and Rhizodonts describes the role of
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species‚ occupied Earth. By 30‚000 years ago‚ however‚ only Homo sapiens—the most modern species—remained. One of the most hotly debated issues in paleoanthropology‚ the study of human origins‚ focuses on how Homo sapiens evolved to outlive the other hominids. The current best explanation for the beginning of modern humans is the Out of Africa model. This holds that Homo sapiens arose in Africa and gradually replaced hominid species in the other parts of the world to which they migrated. To address
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trying times‚ by providing hope. Happiness‚ sorrow‚ victory‚ defeat‚ day-night are the two sides of the me . Similarly life is full of moments of joy‚ pleasure‚ success and comfort apointed by misery‚ defeat‚ failures and problems. There is no human being on Earth‚ strong‚ powerful‚ wise or rich‚ who has not experienced suffering or failure. Life is beautiful but not always easy‚ it has problems‚ too‚ and the challenge lies in facing them with courage‚ letting the beauty of life act like a balm
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题目: There are many extinct animals’ species in the world nowadays. Some people say we should protect these animals from dying out‚ while others say that we should concentrate more on problems of human beings. Discuss both opinions and give your own view. 正文： Nowadays‚ the issue regarding the priority between protecting endangered animals and solving social problems of humankind is put into fierce debates among citizens. From my perspective‚ I tend to believe that it’s more essential for us to
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Introduction According to Haider Rizvi (2007)‚ “We are living beyond the means and capacities of our planet.” The Earth is being damaged badly daily. Humans are destroying their unique shelter. A rapid increase in the human population and an increase in the standard of living have resulted in widespread damage of the environment. People are destroying habitats and reducing the amount of land available for other organisms by building‚ quarrying‚ farming and dumping waste. The more society
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Human tendencies Every human‚ regardless of culture‚ place or time of birth‚ exhibits several tendencies. Guided by these tendencies at each stage of development‚ human seeks out the experiences in their environment that will best serve his development. Human being try to create order‚ to find meaning‚ to explore environments‚ to communicate with people around him‚ to pursue activities that are meaningful to become precise in his movements and in his thinking‚ and to work towards self-perfection
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about him‚ and entered it in a competition. He won a $1200 holiday‚ and gave it to the man that lost his family. That man then went to Germany to see other family members. I think that was a beautiful thing to do‚ and clearly brings out qualities in human beings. Throughout the tests of time men and women across the world have shown they really are in times of conflict. In times where the true character of a person is really put to the limit‚ people are able to see who they really are. These conflicts
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The Definition of Human and Cloning Human: a living person that possesses character and individuality(a questionable definition in the presence of cloning).The unresting attention on biology and genetics has finally contribute to the development of human cloning‚ an addition to scientific achievements yet an unforgettable scar in life. Through constant research and experimentation on countless animals‚ the present generation of scientists can now use artificial methods to create a duplicate of
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I. Definition of Terms 1.) Human acts – Acts that are done with intellect‚ will‚ knowledge and consent. 2.) Acts of human – Acts that do not involve intellect‚ rationality and will such as breathing. 3.) Dictates of Reason – Shared consciousness of wise people about manner of action or behavior 4.) Choice – An act of selecting or making a decision when faced with two or more possibilities. 5.) Conscience – Ability or a faculty that distinguishes whether one’s actions are right or wrong. II
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Anthropology • The Human Species has evolved from numerous primates throughout the past millions of years through natural selection • Natural selection: Organisms that best adapt to their environment to survive produce offspring. • Through natural selection humans have characteristics that make them Unique • Humans are the only mammals that are bipedal • Bipedalism: using two legs for walking • Other primates such as chimpanzees‚ and gorillas have the ability to walk
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