Scientists have described about five forces of human evolution. The common ones include genetic drift, mutations, natural selection and gene flow. Although some of the theories have raised disputes among biologists, each of the aforementioned phenomena has a tremendous impact on the population Jul 19, · There is a theory that humans descended from an earlier, lower form of life. There is an assortment of evidence that shows that all living creatures on Earth descended from a common ancestry. Evolution doesnt discriminate against humans. It is believed that we May 04, · Human evolution is the origin and evolution of Homo sapiens as a species that can be distinguished from other hominids, great apes, and mammals
Human Evolution Essays: Examples, Topics, Titles, & Outlines
There is a theory that humans descended from an earlier, lower form essay on human evolution life. There is an assortment of evidence that shows that all living creatures on Earth descended from a common ancestry. Evolution doesnt discriminate against humans. It is believed that we too are a product of an earlier predecessor. The similarities in all life are evident if you consider that every form of life builds from the same building blocks—20 essential amino acids, four nitrogen bases, and simple sugars.
Each of Earths past and present forms of life are, or were composed of a combination of those building blocks called RNA or DNA. In the very beginning of essay on human evolution on Earth, the genetic structure was very simple, but as time has gone by, the best combinations in the genetic sequence were individuals that reproduced. Over the approximated 3, essay on human evolution.
Only very few of the genetic mutations are indeed beneficial to the function of the species. Negative mutations give the life form a disadvantage for survival, essay on human evolution, thus reducing its chances for reproduction, but a positive mutation gives the species an advantage to survive and produce offspring.
The offspring have a copy of the positive mutation now in their genetics to eventually pass down to their young and so on. Now you can see how the positive mutations have a way of piling up into different piles, which is why our result is a widely diverse life, which exists on Earth today. This theory of how evolution came to be is known as natural selection.
It states that a weaker individual has a lesser chance for survival and reproduction than that of a stronger. Its natures way of weeding out the bad and seeding the good. In the study of evolution, evolutionary scientists try to find the ancestry and genetic relations between organisms. They try to map out the path of the ancestry between organisms over the existence of the Earths history. Another essential part of the study of evolution is actually making educated predictions of the history of a species.
The history of a species includes the geographical distributions and the species population over time. All of the information that follows is valid in that it has genetic and fossilized evidence to prove its merit. Some of the most important aspects that make a human different from its ancestors are the development of communication, brain function, essay on human evolution, and the ability to walk upright, which frees up the hands to embark on other tasks.
Language is considered by many to be the most unique of all the human attributes. As strange as it may sound, genetically we are the most similar to that of primates as any other known living creature on Earth. The primate family includes chimpanzees, essay on human evolution, orangutans, gorillas and even humans.
Other than genetic similarities, we can show other likenesses in the tissue physiology and also by comparing brains circuits in a brain analysis. Humans are a prime example of natural selection. The domination of the world by the superior present day human is what ended all similar species.
The species that we dominated were our greatest competition for food, intelligence, and essentially our very existence on this planet. When we beat our predecessor, we did it in a fight for our lives, not so much as an act of violence.
In many cases, Humans may have killed our ancestors in a misunderstanding, not knowing why a similar being was so much more savage and violent. We may have protected our families by attacking these beastlike creatures. The first things that we need to know are, Who essay on human evolution our first ancestors? Why did they evolve? What did essay on human evolution look like?
And how did they live? Without this information, we will not know what we have arisen from. The most likely place to look for our fossilized lineage is in the environment of our closest living relatives—Africa.
This is the reason that most of our archeological digs have been occurring on this continent. Of the essay on human evolution found, the skulls have been the most important because by knowing the structure of the skull, we can see how distant their relations are essay on human evolution us. Since one of the most significant changes is brain size and function, the brain and brain cavities provide a lot of evidence for evolutionary change.
We know about brain function from fossils because sometimes, even the brain is preserved inside the fossilized skulls. Our most distant known lineage into the human essay on human evolution is very much similar to that of a chimpanzee. This creature was known as Australopithecus afarensis and can be dated back to 3. afarensis was still very similar to a chimp. The brain size was no larger than ours. The finger bones were still curved, showing that it was still quite comfortable in the trees.
Even though it was slightly similar, it was still very different. afarensis had smaller canines than a chimpanzees. The face structure was more vertical with less snout. The spinal column was more upright than that of a chimp. The hip bones also showed something unusual—this animal walked upright. This was the first step in our direction from that of our most distant living relative.
The famous Lucy fossil was the remains of an A. This fossil showed that the A. afarensis, although different than chimps, still had a small rib cage and a large gut that was essay on human evolution for digesting the large amount of vegetation that made up their diet.
From the large gut, we can speculate that the diet of A. afarensis consisted of still mainly vegetation, and not yet much protein.
While the Australopithecus afarensis existed, there was a great climate change in Africa. The once tropical African continent warmed and the main portion of the continent closest to the equator turned to dry grassland. The food that A. afarensis was accustomed to eating, had disappeared.
Many of the chimps, like other animals, essay on human evolution, migrated south to the bottom tip of Africa. There in the forest, this upright primate had a disadvantage to the chimps, so it quickly died off in the forests.
The Australopithecus that stayed had to adapt to survive. There was very limited food that these creatures essay on human evolution digest; they could not process the fibrous grasses that covered the plains. The Australopithecus split into two different forms of the species—a robust more animal-like version and a graceful more human-like model.
The robust version adapted to eat the roots of plants. The tough root and difficult dig to obtain the meal resulted in a large-jawed, thick-skulled, digging creature. The smaller, more graceful was the one humans are in closest relation to. We find it evident in the size and shape of the brain found in fossils. These are the first of our ancestors that used stone tools. These stone tools were the adaptation that fueled their kind. The stone tools at the time and great intelligence were what allowed them to obtain food.
When scavenging for food, they would take a completely cleaned animal carcass and using their simple stone sledges, smash open bones and eat the protein rich marrow from within. They would also use their hammers to crack open the skull to obtain the brain, which was also rich in protein. The advantage here is that they had no competition for their newly found food because no other creature could access these meat reserves. The protein they were ingesting was food that was high in energy and much easier to digest than plant material.
After generations went by, the large digestive track was slowly shortened because it was no longer needed. As the size of the animal lessened, the ratio between weight and energy rose. This gave room for the brain of these graced Australopithecus to adapt to the environment, and since intelligence is what kept this branch alive, their intellect developed more. The individuals who where the most intelligent made the best tools, and thus had a better chance for survival and reproduction.
Tools, meat, and larger brains were the reasons that this species strived, but if you take out any of these vital parts, the others couldnt develop. Homo erectus is the next known ancestor down the branch to humanity. He dates back to 1, essay on human evolution.
erectus looked much like human, but still had a mind no more complex than a chimps. The brain of H. Homo heidelbergensis shows much more human-like characteristics than its predecessor, Homo erectus. The first evidence of H. heidelbergensis in Europe dates back to. There have been 5 tons of remains found in circle patterns in a small area.
The circle patterns are evidence that they were living in round, maybe hut-like enclosures. When you consider the small area in which they were found, you can see that possibly they lived in a small community.
Now living in Europe, having shelter was essential because Europe was a great deal cooler than their arid grasslands in Africa, essay on human evolution. Shelter is probably what allowed them to venture out of Africa for the first time, because without that support, they would surely freeze in the cold season.
In a cave in Italy, scientists have found the skeletal remains of one of these male creatures and the skeleton was essay on human evolution quite well. Deep in this cave, it has been partially covered by crystals that the cave has formed.
By measuring the size of these bones, we know the size of this creatures male gender. This Creature used stone tools, but they used better stone like flint. Their tools were much sharper and lighter.
Trick To Learn Human Evolution Stages Of Human Evolution class11 NEET and AIIMS
, time: 6:18Human Evolution and Archaeology - Words | Essay Example
Nov 19, · Human evolution is the biological and cultural development of the species Homo sapiens sapiens, or human beings. Humans evolved from apes because of their similarities. This can be shown in the evidence that humans had a decrease in the size of the face and teeth that evolved. Early humans are classified in ten different types of blogger.comted Reading Time: 6 mins Persuasive Essay On Human Evolution; Persuasive Essay On Human Evolution. Words 6 Pages. Show More. Human evolution is a very controversial topic these days. There are two sides of the story for the past of human evolution, the creationism and scientific facts. But as for human evolution of the future there are many options Jul 19, · There is a theory that humans descended from an earlier, lower form of life. There is an assortment of evidence that shows that all living creatures on Earth descended from a common ancestry. Evolution doesnt discriminate against humans. It is believed that we
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