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The Theory of Evolution (by Natural Selection) | Cornerstones Education

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Speciation | Prezygotic vs Postzygoic Barriers | Forms of Reproductive Isolation

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Formation of New Species by Speciation | Evolution | Biology | FuseSchool

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All the dogs we have today were descended from one group of grey wolves.

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Human evolve from monkie

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The theory of evolution explains how the great diversity of life developed from one organism.

Changes happen via DNA mutation and recombination.

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Theory of evolution explains the great diversity of life developed from 1 organism.
Offsprings inherit a mix of parents traits and traits of their own and over the years with DNA mutation and recombination animals may even evolve into other species.

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Evolution is change in the heritable characteristics of populations over the generations. These characteristics are the expressions of genes that are passed on from parent to offspring during reproduction. DNA mutations occur when there are changes in the sequence that makes up a strand of DNA.

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When organisms reproduce, the offspring which is produced  has traits of its own and some of them are inherited from their parents. With time these traits are passed on from generation to generation and are more developed. These small changes add up and often leads to a formation of new species due to DNA mutation

DNA is often referred to as the building block of the life and it contains all the information about the growth and function of cells.  A mutation in the DNA occurs when there is an error in the copying of the DNA.

DNA recombination- is the new traits formed by the combination of the parental DNA

Selective Breeding- only the desirable characteristics of an organism are interbred to pass them on to the offspring. Such as dogs (descendent of wolves)

Time is the key factor of evolution in organism. organisms are evolving but these changes are prominent with time.

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- Theory of evolution explains the great diversity of life developed from 1 organism.
-DNA is the building block of life.

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The scientific theory of evolution by natural selection was by Charles Darwin and Alfred Russel Wallace in the mid-19th century. Evolution by natural selection was first demonstrated by observing that the more offspring are often produced than can possibly survive.

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Animals eventually adapt themselves to the environment they live in and pass on that adaptation to their offspring as well.

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Darwin realized that the different beaks matched the type of food available on each island.
His theory tells us that species adapted their physical features to the environment they lived in and the availability of food around them.

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All life on earth have a common ancestor which lived 3.5 billion years ago.
DNA is the building block of life.
DNA mutations happen due copying errors.

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Darwin's theory told us that species adapted their physical features to the environment and the food availability around to survive. These caused a natural variation in organisms of the same species as well.

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The Scientific Theory of Evolution through natural selection was conceived by Charles Darwin. Developed in the mid nineteenth century, this theory was initially brought about by the observation that the number of offspring produced surpassed the rate of survival. Furthermore, Darwin noticed the adaptability of species, in order to survive in the constantly changing environment. He did this by observing finches, and arriving at the conclusion that his theory of adaptation and survival of the fittest is applicable to almost all species.

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- The scientific theory of evolution through natural selection was conceived by Charles Darwin as well as Alfred Russel Wallace.
-Darwin suggested that humans share the same ancestors with modern apes

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Speciation, the formation of new and distinct species in the course of evolution.

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natural selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin, and it is now regarded as be the main process that brings about evolution.

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Speciation is the formation of a new species from a current species and does not share its genetic information with the rest of the species known as reproductive isolation.

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-Speciation is the formation of one or more new species from the current species.
- Prezygotic barriers- before fertilisation
Postzygotic barriers- after fertilisation

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Darwin's theory states that animals eventually adapt to their surroundings in order to survive and thrive. Which is also known as the survival of the fittest

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Speciation is the evolutionary process by which populations evolve to become distinct species, they do not share their genetic specification with the rest of the species known as reproductive isolation.

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For speciation to take place, two  populations must be formed from one population and they must evolve in a way that it becomes impossible for individuals from the two new populations to interbreed.

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Through the process of natural selection species which are able to sustain isolation evolve and change. Over time, they change in a way that they become incapable to interbreed with other isolated populations.

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The Theory of Evolution explains the diversity of life through several factors, taking adaptability, and availability of resources into consideration. Due to DNA mutation, each new species is seen to be more developed than its previous ancestor, resulting in new species' that often barely resemble its oldest ancestors. Selective breeding occurs when only specific characteristics, essentially the desirable ones, are interbred and utilised to create new species.

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The theory of evolution was first introduced by Charles Darwin. He studies finch birds and observed that all the birds have beaks length of different sizes.and these sizes were dependent upon the availability and the resource of food available on each island.

This concludes that due to external environmental factor organisms develop and adapt overtime and evolve with time in order to survive with those conditions. Example- elephants have evolved with smaller tusks generation by generation The reason behind this that poachers are killing them for their tucks and soon a species of elephants had been predicted to evolve with no tusks.

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Isolation is the first step in the formation of new species. The species that adapted and survived to conditions like food, climate and competition survived.

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Speciation is the formation of a new species from a current species
Reproductive isolation includes Prezygotic barriers and post zygotic barriers. Prezygotic barriers result from some sort of isolation and post zygotic barriers is when mating occurs, offspring not fertile and viable.

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Speciation is the formation of a new species from a current species and does not share its genetic information with the rest of the species known as reproductive isolation. 

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Through the process of natural selection species which are able to sustain isolation evolve and change. Over time, they change in a way that they become incapable to interbreed with other isolated populations. 

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This theory suggests and explains that the various organisms that exist, require many things taken into consideration, including adaptation. The DNA of both parents are used to create and help identify the offspring. Selective breeding is used and happens when a singular or multiple specific properties are taken and put together to create a selective and unique offspring that has both properties from parents.

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Speciation refers to the formation of a new species from a currently existing species. This evolutionary process allows species to develop and evolve to become distinct species that do not share any genetic resemblance with other species. This is termed as reproductive isolation.

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speciation occurs when new species are evolved from the current species.

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Charles Darwin's theory of evolution was pivotal in the study of species. Birds have different beak lengths and are of different sizes. These specifications are subject to the environmental factors around them.

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Speciation is the formation of a new species ...

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Natural selection allows species to sustain isolation and evolve, through adaptation and survival in tough conditions. After a certain point, the development ceases to be comparable to its previous species.

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What happens when continents collide? - Juan D. Carrillo

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Tectonics plates move because they are carried along on currents in the upper mantle. Converging currents bring plates into each other while diverging pull them apart.

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difference in converging and diverging currents is that converging currents drive plates into each other and diverging pull them apart.
The mantle is in a continuous process of hot mantle rock which rises when its hot to the crust until its cool and then sinks back to the core.

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crust underneath the earth surface is known as tectonic plates and they are always under motion. All plates have different speed of their movement depending upon on the location of that geographical area. This system can moreover be seen as the conveyer belt and the luggage as our continents

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Tectonics plates are carried along on currents in the upper mantle, the slowly flowing layer of rock.

Converging currents drive plates into each other and diverging currents pull them apart.

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If a converging plate breaks, then it creates a suction force which pulls the remaining plate towards itself.

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Tectonic plates, both a part of an under the Earth's surface known as the Earth's Crust. Are individual slabs of rock and minerals that are constantly in motion, gliding over the Earth's Mantle. All continental and oceanic plates have varying speeds of motion. The plates are also destructive. Diverging plates pull each other apart leaving raw and extremely hot temperatures between gaps. Converging plates push themselves into each other. Like extreme mountain areas.

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The Plates that are found underneath the surface of the earth are commonly known as the "tectonic plates" and they are always under motion no matter what the situation

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Continents collide at convergent plate boundaries such like north and south america. After this collision, species migrate from each sides to inhabit the other land through land bridges that are created by the continental drift and can lead to a process of speciation when new species will be formed by interbreeding as well as adapting to new climate.

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When North and south America collided and became one, species from one part of the land migrated to another and occupied the ecological space left behind.

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The idea that our planet’s continents drift around the globe, periodically glomming together and breaking apart, is at least 200 years old. it clear that the Earth’s crust is broken up into fragments, and that those fragments, called tectonic plates, are moving. When an ocean plate collides with another ocean plate or a plate bearing the thick crust of continental landmasses, the thinner of the two plates bends and slides under the othee.

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Tectonic plates move because they are carried along on currents in the upper mantle.

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This video aptly depicts the theory that the current state of the world isn't constant and is constantly changing. This theory is supported by the discovery of tectonic plate, fragments of the Earth's crust that move around and are individual slabs of rock and minerals in perpetual motion, regardless of the situation. Drifting over the Earth's mantle, diverging and converging currents beneath the plates ensure the direction the plates move in, as well as the movement of continents above. The formation or deformation of land masses is dependent on two factors: the speed of the tectonic plates, and the direction of the mantle current.

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North and south America were once two continents which were separated by marine connection between pacific and Atlantic ocean. Both these continents has species of their but with over time as the crust below the earth surface started moving and this caused movement of different of continents towards each other which eventually allowed all the species from different continents to come together. some animals adapted to the new chnages over time and some could not and hence became extinct in the process.

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North America and South America connect due to the shifting of the Farallon and Caribbean plates, this produced the central America volcanic Arc.

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South America was the home of fauna that included armored glyptodonts, as bog as compact cars, giant ground slpths weighing more than a ton, etc.

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Continental collision is a phenomenon of the plate tectonics of Earth that occurs at convergent boundaries. Continental collision is a variation on the fundamental process of subduction, whereby the subduction zone is destroyed, mountains produced, and two continents sutured together.

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Continents are seen to collide at converging plate boundaries, as diverging currents force plates to move in opposing directions. Continental collision can be defined as a variation of the process of subduction, a process during which the edge of the Earth's crust moves sideways and downwards into the mantle beneath another plate. This leads to the converging of two continents and begins the process of speciation, as the formation of land bridges causes migration, which in turn causes interbreeding and allowing species to adapt to new conditions.

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When a continental and an oceanic plate collide, the oceanic plate slides underneath the continental plate, which leads to the formation of volcanoes due to the rocks in the oceanic plate turning to magma as they are sucked deeper into the earth. This happens due to the fact that oceanic plates are denser than continental plates.

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The collision of continental and oceanic plates forces the latter to slide below the former which in turn leads to the formation of volcanoes and other geological structures.