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What is Evolution
Transcript of What is Evolution
What is Evolution
Evolution is the process in which different organisms have adapted and changed over the course of millions of years because of their environment and other factors.
Charles Darwin was a British naturalist who first theorized the concept of evolution on the Galapagos islands. During his trip on the HMS beagle Darwin encountered the Galapagos islands. On each islands he encountered many species of finches and tortoises. When he noticed that all of these species(a group of living organisms that can exchange genes or interbreed) adapted to each or their environments. He created his theory that stated that all species must have derived from a common ancestor.
Evidence supporting evolution
There are many pieces of evidence that support the theory of evolution. One of the major evidence sources are fossils. Fossils can show many evolutionary lines for example a horse. It can show how over the course of millions of years the evolved species that we call the horse derived from a completely different species. Fossils are just one example of one overall subject that we call biological evidence. Biological evidence includes biological pieces of an animal left behind. This allows us to add onto the extensive fossil record and diagram of common ancestors. A fossil record is a record that contains all fossils ever found by humans.
An example of a species that has evolved.
Mechanisms of evolution
Living organisms aren't the only ones that have evolved. Things such as computers and cars have evolved. Cars used to be powered with a lever that had to be cranked every time now we have cars that turn on very easily. Computers are another example. Computers used to be so large that they took up an entire room. Now we have portable laptops and the speed of the internet.
Whales are species that are living proof of the effects of evolution. Whales used to be wolf-like creatures known as Indohyus. Later the Indohyus evolved slowly over millions of years forming what we know today as a whale.
Homologous and Analogous structure
A homologous structure is parts of the body that are similar in structure to other species with comparative parts
Examples of living species that is or has been evolving
by Michelle Rodriguez-Gonzalez
Natural Selection is the one evolutionary process in which organisms better adapted to their environment survive while others die out. The main goal of an organism is to survive and to pass on their traits. Those not suited for their environment won't live to pass on their traits and others who are adapted can pass on their traits allowing their offspring to have a better chance of survival and therefore forming a species that is suitable for that environment.
A mutation is an evolutionary process in which a genetic mutation alters the physical attributes of an offspring causing either a good or bad evolutionary traits. Most of these mutations usually benefit the certain species.
Migration is when one sub species joins another and the more well-adapted subspecies combines with the other subspecies creating a better outcome for the other new adaptive species.
One generation of a beetles may have more green that brown species soon the brown will slowly increase by chance. This is called genetic drift.
Polar Bears are a living species that is continually evolving due to the melting of the polar icecaps. Because of global warming polar bears are on the brink of extinction(extinction-when a species has died out). To get food the polar bears need to swim long distances and so those not adapted to swimming will not be able to survive. The polar bears might soon not be land animals due to the fact that they are adapting and evolving to how and where they get their food.
An analogous structure is various structures in different species containing the same appearance.