Mutation, migration, genetic drift, and natural selection are basic mechanisms that apply to both micro- and macroevolution to determine these patterns. Changes and extinctions that have happened over the years are all part of macroevolution. Some changes take place slowly, this is called stasis. Extinction is an important part of evolution. Every species has a chance that it will become extinct.
Microevolution is an even more important part of the evolutionary theory. As previously discussed, it is evolution on a small scale. It is the changes in animals to adapt to their habitats and the changing environment. Microevolutionairy changes can be seen by changes in gene frequency. A few of the mechanisms that affect these changes are mutation, migration, genetic drift, and natural selection.
The genes in the yellow bird would have been mutated to produce purple chicks. If the purple chicks moved to another island, and the yellow birds on that island immigrated to the island that purple birds had previously inhabited, that is known at migration, or gene flow. When a mutated gene is passed to more offspring and out numbers the original colored offspring it is called genetic drift. As for natural selection, it means that the more well equipped animals are the most likely to survive.
For example if the purple birds lived in a purple tree they would be more likely to survive than their yellow relatives in a purple tree. A test for preformed on sand colored and dark colored mice, showing that each mouse matched the color of their corresponding habitats. Ideas about evolution extend to different types of science as well. Biochemistry is also interested in this topic.
It shows that there is a surprising amount of evolutionary evidence within the human body, bacteria, and fungus. There is fossil evidence that supports the evolutionary theory. Paleontologists have found and studied different species of fossils and have concluded that some fossils found were related to fossils found prior to the dig, or after.
These fossils just had changes to them, evolution it could be said. The most convincing arguments for evolution seem to be fossil evidence and the evidence that the fossils have evolved from other, previous fossils.
Human are even evolving. Evolution is supported through fossil records. The study of the sequence of occurrence in rocks reveals the relative time in which organisms lived.
This technique shows that one layer of rock is older or younger than another. Later through the discovery of radioactivity, scientists were given the opportunity to learn the age of fossils and rocks.
Through these records, a vague timeline is illustrated of the evolutionary change that has been occurring over the past four billion years. This proves that the earth is much older then creationist would like to argue. A specific example of this is the Archaeopteryx. This was the earliest and most primitive bird known. The London specimen of this bird was discovered only two years after the publication of On the Origin of Species.
Fossils records are one factor that works to make evolution true beyond a reasonable doubt. Evolution is supported through hominoid fossils. Hominoids are those belonging to the super family Homiondea which includes apes, humans, and, sub-species in between this spectrum. Evolution refers to the slow process of human adaption over millions of years, so hominids are crucial in giving legitimacy to the concept that humans were slowly developed and that there ancestry is rooted in another species.
The roots of humanity are believed to be located in South Africa where the earliest hominoids are discovered. Many hominids fossils of fragmented body and skull have been discovered. Lucy was an adult female of twenty-five years olds and is placed into the Australopithecus afarensis category. Hominids are a major support of evolution.
Evolution is supported by transitional fossils. Transitional fossils are the remains of intermediary forms of life that illustrate an evolutionary transition. Such fossils would serve as evidence to the principle that life is developed through evolving organisms, which again, points to one ancestral source.
Some examples are the Nautoloidea, this is a group of marine cephalopods belong to the subclass Nautioidea. This is one of the many examples of one transitional forms discovered through fossils linking one species to another. Examples of these links are fish to tetra pods, amphibians to amniotes, and dinosaurs to birds. Transitional forms are a major support of evolution Fossils through fossil dating, hominoid fossils, and living fossils shed much light to evolution and its validity.
Although it only covers a small section of the multi-faceted theory, it is a crucial one. Fossils can be used as a testament to the gradual changes in nature and in mankind. It also shows that the world is extremel.
Are you sure you want to delete this answer? This is a really good essay. I am doubly impressed that you were able to research this with very little help from your school and teacher who apparently treat evolution like like an unpleasant but unavoidable pair of smelly socks they have to deal with. So this idea that they teach kids nothing about it other than to send them out to get "education by Internet" and return with reasons why one of the core principles of science are wrong, is just a HORRIBLE approach to education.
But you have seen past that and seem to have found some good sources. Darwin's theory explains WHY evolution change occurs. His theory is called 'natural selection', which you don't cover and that's fine. By the way, here's a source you can cite for that definition: This is only one small part of the evidence for evolution. The DNA evidence alone is enough to establish common ancestry between species, even if not a single fossil had ever been found!
However, I notice from your other post, that you seem to be required to limit your essay to just fossils. Your main body needs to cover a selection of subjects about evolution, each subject should be written about for a full paragraph and each paragraph should only be about that subject. These can cover different areas such as:.
Your different sections will require a series of simple notes or bullets within your outline that you can then use as a guide for when you write each paragraph.
Depending on the focus of your essay will depend on which specific subjects you cover but you should aim for between different paragraphs depending on the expected length of your essay.
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This essay will focus on: the early evolution of our eukaryote ancestor during Precambrian period, plastids origin along the algae family due to second endosymbiosis; discuss the evidence that supports the theory, including further examples of .
Essay on Evolution There are many mechanisms that lead to evolutionary change. One of the most important mechanism in evolution is natural selection which is the differential success in the reproduction of different phenotypes resulting from the interaction of organisms with their environment.
May 16, · Evolution Essay Evolution is the theory that all living forms came from ancient ancestors. Through a series of mutations, genetic drift, migration, and natural selection today’s descendants show an amazing amount of similarities and diversity. Free Essay: Evolution Evolution is a complex process by which the characteristics of living organisms change over many generations as traits are passed from.
Sample Essay - Week 4: Speciation and the Fossil Record This essay was developed for the AMNH online course Evolution. Evolution is a part of Seminars on Science, a program of online graduate-level professional development courses for K educators. Essay on The Validity of the Theory of Evolution - Since the publication of Charles Darwin’s Origin of Species, in which the theory of evolution has risen, people have debated the merits of the theories of creationism and evolution.