There are quite a few theories about the origins of human beings on this planet. Depending on who you are and how you were raised, any one may seem obvious to you while the others are foolish or even dangerous. This essay looks at three possibilities any of which may one day be definitively proven to be true.
The Scientific Version: Evolution
It is generally accepted that every species on the planet can go through significant changes given a long enough period of time for observation. With this in mind it is believed that life began in some of the wettest hottest parts of the planet at the time. Experiments have shown that amino acids, the building blocks of life can be formed out of material that showed no signs of life before. Under this theory, over millenia, organisms encountered slightly different environments and those with the best traits reproduced until the most suitably evolved version of any creature finally arrived. Humans are thus seen as having evolved from the same ancestor as the great apes.
The Religious Version: Creation
There is more than one religious version with slightly different flavors. The basic idea behind all of them is that some superior entity created human beings because he or she wanted to. People therefore arrived on this planet in much the same form that they currently occupy and are no more related to the other animals than birds are to octopuses. The evidence for this is difficult to find but for many it comes down to faith anyway. Because the holy books say it is so, people who believe are expected to take it as fact. A few have developed their own hybrid theories in which the superior deity used evolution in order to create mankind gradually.
The Alternative: Transplantation
This may be seen as even more of a hybrid theory if one looks closely enough. This theory states that human beings exist n this planet because a superior alien race planted the DNA within it so that we would eventually evolve. Think of it as a planet wide science experiment. Another version states that an asteroid with a tiny bit of living organisms within it may have impacted with our planet and thus provided the first signs of life.
There is nothing wrong with having more than one theory to refer to. It may even lead to healthy discourse and so should be encouraged.
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The History Of Human Evolution Essay
The History of Human Evolution
By definition, human evolution is the development, both biological and cultural, of humans. Human ideologies of how the evolution of man came to be is determined by cultural beliefs that have been adopted by societies going back as far as the Upper Paleolithic era, some 40,000 years ago. Through the study of paleoanthropology, we have come to determine that a human is any member belonging to the species of Homo Sapiens. Paleoanthropologists, while studying the evolution of humans, identify and explain evolutionary changes that occur throughout time that aid in the development of the human species. It will be through the examination of human physical traits, human origins from pre-humans to modern humans, and major discoveries that we will be able to understand the history of human evolution.
The Hominidae, or hominids are a group of upright walking primates with relatively large brains. The only existing representative of this family is the Homo sapiens. We can declare that all humans are part of the hominid family, yet not all hominids can be considered humans. However all humans are primates; although humans have developed very distinct traits from its genetically similar primate, the chimpanzees, such as bipedalism, meaning walking on two legs. “Bipedalism seems to be one of the earliest of the major hominine characteristics to have evolved.”(Microsoft Encarta) Bipedalism enabled humans to develop specific physical traits to accommodate their upright posture, such as a specialized pelvis, hip and leg muscles, and an S-shaped vertebral column. These traits, specific to humans, can be detected in fossil records therefore making bipedalism the defining factor in the physical traits of the sub family Homininae.
Another physical characteristic associated with the evolution of humans is that of the brain size. Modern humans have a “braincase volume of between 79.3 and 91.5 cubic inches”.(Gallagher) Throughout the development of humans, one can notice that the brain has more than tripled in size. This augmentation may be related to behavioral patterns of the hominids with an increase in number and sophistication of stone tools and other artifacts. The art of tool making along with other learnt skills made it possible for hominids to heighten their ability to live in a range of different environments.
“The earliest hominine fossils show evidence of marked differences in body size, which may reflect a pattern of the different sexes in our early ancestors”.(Gallagher) Females tended to be smaller, weighing in at about 70 lbs and measuring 3 to 4 feet tall, while men were on average 5ft tall and weighing 150lbs. This drastic size difference between genders decreased through time, sometime after a million years ago. “The third major trend in hominine development is the gradual decrease in the size of the face and teeth.”(Microsoft Encarta) Unlike the apes (from whom...
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