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A creature named He Deserves No Name visits Chernobyl, Ukraine. The radiation causes a genetic mutation. He mates with other creatures and to his offspring, who spread the mutated gene to their children, and so on.

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There are two populations of red and blue birds. The red birds sends a spy over to the blue birds, but the red bird falls in love with a blue bird. Once they understand their genetic diversity is equivalent they convince the red and blue birds to stop the war, and to effectively become a single population

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A colony of ants are all the same one ants comes in that is different from the others and mates with the others and the ants begin to become different from each other

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a women chooses to marry this guy because hes a good dancer and since she's also a good dancer that trait will be passed down their offspring.

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Billy was tired of being bold, he wasn't comfy with tha so he went to buy fake hair and put it on. He has hair now so do his offsprings, everyone is happy.

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There was a thunderstorm that destroyed the birds ecosystem making them migrate to another colony of birds

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The crabs population has been increased in Canada and Australia. The population exchanged the genes between two populations of crabs.

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a women chooses to marry her husband because he's a really good dancer and since she's a good dancer too they are gonna have the trait passed down their family, benefiting the offspring.

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there was a village of people named the namama. the namama were consistently being attacked by bears. over time, the namama developed knives for hands in order to survive.
natural selection

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A female bird has to choose between a colorful bird and a colorless bird and she chooses the colorful bird because she finds him more attractive

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attacked by sharks in sharknado 3 so most of the cows are wiped out of the population.

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After a nuclear power plant leaked radioactive fluid, horses in that area began developing a spiral horn-like structure at the tip of their skull. Enough horses were affected that this new, horned species began breeding with the general population and spread the allele to grow a horn.

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There are two populations of red and blue birds. The red birds sends a spy over to the blue birds, but the red bird falls in love with a blue bird. Once they understand their genetic diversity is equivalent they convince the red and blue birds to stop the war, and to effectively become a single population

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A shark wants to be able to live on land,so overtime this shark spends short periods of time breathing air, his body adapts to this type of lifestyle. These traits get passed on to his offspring and over the course of generations this helps the shark population.

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There was once a bird who was in love with another named Becky. He would give her sticks and blue objects to impress her. However she was not interested and wanted to be with a more colorful bird named Ben. Ben had a bigger tail. Sexual selection

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One island contains red cattle and another nearby island contains blue cattle. After one red cow swims to the blue cattle island, and many generations pass, there are two islands: one with red cattle and one with purple cattle.

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Period 3
Dodo birds who looked like chickens,the majority were eaten but some began to look less appealing in order to survive so their feathers looked wrinkler so they were not eaten as often.

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Mutation
A change in the amino acid sequence of a human results in a blue-skinned human. After hundreds of generations of mating, the trait is passed onto offspring and 3/4 of the new population consists of blue people.

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There was a population of foxes that were divided among foxes with short legs and foxes with long legs. They were often hunted so only the foxes with long legs survived. So now the new generation of foxes all have long legs so they easily escape their hunter.

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Male birds in a species used to have these brown and black colors that didn't look very good, but after a while, they began to be born with blue, red, and yellow colors in order to attract females.
This is sexual selection.

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A woman applying makeup to look better and more attractive for males to notice and possibly be attracted.

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A spaceship crashes into an island where a population of spotted meerkats and striped meerkats reside, as it wiped out the striped meerkats leaving the spotted ones left behind in the island due to the catastrophe.

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One day, a female bird finds a peacock, and is attracted to it because of its many colors. Then it leads to the original population of the female bird to have the peacock's genome.

Sexual Selection

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- The population consisted of furry polar bears and hairless polar bears. One day in Antarctica, a huge snowball the size of an iceberg hit the habitat of the polar bears and wiped out most of the furry polar bears. The hairless polar bears were staying in their home.  All that was left were the hairless polar bears.
Mechanism- Genetic Drift

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-YOUR SCENARIO

(DO NOT MENTION YOUR MECHANISM)