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Eassy on human evolution
Eassy on human evolution
Eassy on human evolution
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The earliest is believed to have risen from apes. This species have been quadruples. The man originated from earliest forms. Evolution of man is mainly explained by the theory of evolution this is the evolution theory written by Charles Darwin. This theory is based on facts that early man originated from a common ancestry. Natural selection is mainly through natural selection, life on earth come from most ever primitive structures that lived million years ago and to change with time man continues to evolve to date. The early man evolved through a series of stages as to reach the modern man. The earliest forms were the Australopithecus species, dated over millions of years ago. This man walked on quadruples. He left on top of trees and used them for shelters and as secure areas from his enemies. His diet was mainly rooted from different vegetation and also ate fruits that grew naturally in the forests. He also left in the dense forests that were mainly covered with dense vegetation. The earliest man’s body was hairy all over the body. His skull was like the modern day apes thus the sk...
The evolution of man is constantly in question. While we are reasonably sure that modern humans and primates are both related to the same common ancestor, there is constant debate over what initially caused the two species to split into early hominids and apes. According to some, our longest and most popular theory on the division of man and ape is profoundly wrong. However, those same individuals usually offer an equally controversial theory as a substitute, one that is almost impossible to scientifically test or prove. Both the Savanna Theory and the Aquatic Ape Theory offer solutions to how and why humans evolved into bipedal toolmakers. But with enough questioning, each loses its accountability to rhetorical science.
Charles Darwin, the Father of Evolution, was a British scientist who laid the foundations of the theory of evolution, transforming the thinking of the entire world about the living things around us (Charles Darwin (1809 – 1882)). After working on his theory for nearly 20 years, he published On the Origin of Species by Means of Natural Selection in 1859. As soon as the book was released, the controversy began with each sides gaining followers until the climax on July 10, 1925. The idea that animals could “evolve” and change into new species, including humans, was one that challenged not only how people thought about the natural world, but challenged the story of the creation from the Bible itself. Even though Darwin himself never said that humans “evolved” from apes, everyone took it as a logical extension of his new theory. It went against the idea of argument for design that had unified theology and science for decades (Moran 5). This new threat to Christianity and the social culture of the time was one that would transform state laws on their educational curriculum.
The theory of Evolution was developed by Charles Darwin throughout his life and published in 1859 in a book called "The Origin of Species." In brief, it states that all living things on earth evolved over time and that natural selection is how they evolve. Natural selection is the process by which entire populations change in response to their environment. It works because those who are better adapted to the environment reproduce at a higher rate than those who are less suited for the environment (Biology, 2001). It is widely accepted that humans evolved from primates. That is why the trial had the nickname of "Monkey Trial". In contrast, the theory of Divine Creation states that the universe was created in seven days by God and that animals have not evolved since. One can see clear differences between these two theories.
Three incomplete skulls of Homo sapiens were discovered in 1997. Bruce Bower’s article “African Legacy: Fossils plug gap in human origins” discusses the fossils. These findings are important because according to the discoverers, they are the oldest known fossils of modern people. The skulls were found in Herto, Ethiopian located in eastern Africa. The fossils are dated between 154,000 and 160,000 years ago.i[1] The fossils were dated radioisotopically.ii[2] Since the fossils are the oldest known fossils of modern people, it is probable that these hominids represent the immediate ancestors of humans that are anatomically modern. Tim D. White’s (et al) article “Pleistocene Homo sapiens from Middle Awash, Ethiopia” describes the discovery of the Herto fossils and the research of the artifacts in great detail.
Australopithecus afarensis existed between 3.9 and 3.0 million years ago. The distinctive characteristics of A. afarensis were: a low forehead, a bony ridge over the eyes, a flat nose, no chin, more humanlike teeth, pelvis and leg bones resembled those of modern man. Females were smaller than males. Their sexual dimorphism was males:females; 1.5. A. afarensis was not as sexually dimorphic as gorillas, but more sexually dimorphic than humans or chimpanzees. A lot of scientists think that Australopithecus afarensis was partially adapted to climbing the trees, because the fingers and toe bones of the species were curved and longer than the ones of the modern human.
Contrary to many assumptions, evolutionary theory did not begin with Charles Darwin in 1859. Actually, ideas similar to evolution had existed since the times of the Ancient Greeks. The idea of evolution teetered in and out between the time of the Greeks and Victorian England. In Darwin's time, evolution was called “descent with modification”(Thinkquest.org). During the eighteenth century, two church officials provided convincing biblical explanations for biological diversity; Separate Creation: the idea that all creatures have been created uniquely by God and organized into a hierarchy with man ranking just below God, and stating the earth is 6,000 years old (berkeley.edu./history/buffon).
Paleoanthropology: Pliocene and Pleistocene Human Evolution. Paleobiology, 7:3:298-305. Frayer, David W. and Milford Walpoff 1985 Sexual Dimorphism. Annual Review of Anthropology, 14:429-473 Key, Catherine A. 2000 The Evolution of Human Life History.
Senescence, usually defined as progressive loss of fertility and increasing probability of death with increasing age (Kirkwood and Austad 233), is clearly a process detrimental to an individual – and, at first glance, hard to reconcile with the process of natural selection ,which would work towards ensuring optimal survival and increasing fitness (reproductive success). It seems, at a cursory glance, that it would also work towards preventing the aging process because aging leads to increased mortality rates and decreased reproductive capability.
“The scientific study of how humans developed did not begin until the 1800s in Europe. Until that time, people relied on religious explanations of how humans came into existence. Starting in the 1500s a scientific revolution began to sweep Europe. Thinkers started using scientific methods and experiments to try to better understand the world and the creatures living in it. Eventually these methods were turned to the question of human origins” (The Nature Of Human Origins, 1). Earth made it possible for species to change over time because Ancient Earth provides ability to plenty of time.The Homo Sapien a is very complex creature. The species started off very simple by living in caves and surviving with little food and then later evolved into a species that were able to do many more complex things. The first species was Sahelanthropus tchadensis They were one of the most simple humans in that time period and on. They had very small skulls compared to Homo Sapiens today and their motor skills were just the same. We have evolved and changed for the better both mentally and physically. The Evolution of Homo Sapiens started off simple, such as the Neanderthals, and now we are the most advanced species to ever walk the planet so far.
When talking about evolution, it is not stating that man comes from monkey but rather that man evolves and adapts to his surroundings and environment due to natural selection. In the days of the cavemen, men were hunting while women were caretakers and cooks. Because men were hunters, they became bigger, faster, and stronger in order to have better skills for hunting which was essential for survival. These men passed down these “dominated traits – some flexibility, an instinctive ability to respo...
The thought of evolution is filled with theories, ideas and beliefs. The definition of evolution is rather simple. According to Jerry A. Coyle, evolution is “the change in the inherited characteristics of biological populations over successive generations (2). Evolution gives rise to diversity when it comes to the hierarchy of life otherwise known as biological organization. Many people find the topic of evolution to be troubling and very confusing. Throughout history churches have preached that evolution is atheistic and a sin if even thought about. Famous scientist, Charles Darwin, is said to really be the first to formulate debated theory of evolution by the means of natural selection. Eventually in the 20th century genetics was compounded with Charles Darwin’s theories of evolution. Even today scientists continue to study different aspects of the theory of evolution.
The evidence for human evolution begins with the australopithecines. All the australopithecines were bipedal and therefore possible hominines. In details of their teeth, jaws, and brain size, however, they modify enough among themselves to be divided into five species: Australopithecus anamensis, A. afarensis, A. africanus, A. robustus, and A. boisei. Genus Homo are also divided in five different spices: Homo erectus, H. habilis, H. sapiens, and H. sapiens sapiens.
1.9 million years ago, Homo Habilis of East Africa had evolved into an entirely new species known as Homo erectus. Homo erectus directly translates to "Upright man" and for good reason. One of largest anatomical advancements of Homo erectus was their arm and leg bones which were very similar in shape and proportions to that of modern day humans. "Their legs would have made Homo erectus efficient long distance runners like modern humans."(Dennis). Along with their longer more developed legs, Homo erectus's leg were also hairless which allowed them to evaporate sweat and thus be more efficient at not overheating. This advantage allowed Homo erectus to chase down four legged mammals to the point of heat exhaustion and thus drastically increase the efficiency their hunting tactics. Another change in the legs of Homo erectus was their slightly more narrow pelvises. This forced the size of a child’s head to be smaller at birth and undergo most of its development during childhood. (Dennis)
Evolution is a systematic mechanism through which the modern day has evolved from his ancestors. The Darwin’s Theory of Evolution is based on the premise that we all
Without evolution, and the constant ever changing environment, the complexity of living organisms would not be as it is. Evolution is defined as a process that results in heritable changes in a population spread over many generations (8).Scientists believe in the theory of evolution. This belief is based on scientific evidence that corroborates the theory of evolution. In Figure 1 the pictures of the skulls depict the sequence of the evolution of Homo-sapiens. As the figure shows, man has evolved from our common ancestor that is shared by homo-sapiens. The change of diet of homo-sapiens over time has thought to contribute to the change in jaw structure and overall skull shape.