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Period 1

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one theory is that some giraffes got a genetic mutation which they then began passing to there offspring. 

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one theory is that some giraffes got a genetic mutation which they then began passing to there offspring. 

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one theory is that the food on the ground was once scarce, so giraffes started to adapt to having to eat from high up treas. this lead to them adapting to reaching high things. 

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one theory is that the food on the ground was once scarce, so giraffes started to adapt to having to eat from high up treas. this lead to them adapting to reaching high things. 

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scientists believe that the growth of giraffes necks happened over a long period of time. 

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scientists believe that the growth of giraffes necks happened over a long period of time. 

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They were believed to once look like deer.  

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They were believed to once look like deer.  

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Giraffes were believed to have short necks a long time ago. 

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Giraffes were believed to have short necks a long time ago. 

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the process of change in the sequence composition of cellular molecules such as DNA, RNA, and proteins across generations

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ontogeny recapitulates phylogeny; is a catchy phrase coined by Ernst Haeckel, a German biologist. 

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ontogeny recapitulates phylogeny; is a catchy phrase coined by Ernst Haeckel, a German biologist. 

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vestigial organs; A rudimentary structure in humans corresponding to a functional structure or organ in ancestral animals.

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vestigial organs; A rudimentary structure in humans corresponding to a functional structure or organ in ancestral animals.

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an example of an organ or bone that appears in different animals

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genetic drift; variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.

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genetic drift; variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.

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the process whereby organisms not closely related independently evolve similar traits as a result of having to adapt to similar environments or ecological niches.

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Variation
Inheritance
Selection
Time

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preference by one sex for certain characteristics in individuals of the other sex.

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Mutation ; the changing of the structure of a gene, resulting in a variant form that may be transmitted to subsequent generations, caused by the alteration of single base units in DNA, or the deletion, insertion, or rearrangement of larger sections of genes or chromosomes

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Mutation ; the changing of the structure of a gene, resulting in a variant form that may be transmitted to subsequent generations, caused by the alteration of single base units in DNA, or the deletion, insertion, or rearrangement of larger sections of genes or chromosomes

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Migration ; Seasonal movement of animals from one region to another

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Migration ; Seasonal movement of animals from one region to another

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Natural selection ; Process of adapting to an environment in order to produce offspring 

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Natural selection ; Process of adapting to an environment in order to produce offspring 