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Because of sexual selection within giraffes, male giraffes fight for access to females. This ritual is referred to as "necking". The rivals stand flank to flank, then start to whack each other with their heads.

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"Giraffes' long necks are the result of generation upon generation of repeated stretching and inheritance."

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Males- up to 18ft tall
Females- a little less

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It is also said that the evolution of giraffes longer  necks are for sexual selection, due to the fact that female giraffes look for males with longer necks.

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It is said that the evolution of long necks in giraffes are so the giraffes can reach the higher trees that the herbivores can't.

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The first person to suggest why long necks have evolved in giraffes is a French Zoologist, Jean-Baptiste Lamarck.

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The Giraffe is the tallest land mammal alive and has seven neck vertebrae.

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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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The development of an organism expresses all the intermediate forms of its ancestors throughout evolution.

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A structure in humans corresponding to a structure or organ in ancestral animals.

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An example of an organ or bone that appears in different animals, underlining anatomical commonalities demonstrating descent from a common ancestor.

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Variation in the relative frequency in 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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Natural Selection arising through preference by one sex for certain characteristics in individuals of the other sex

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Divergent, Parallel, and Convergent Evolution

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Divergent, Parallel, and Convergent Evolution

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The types of Evolution

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Seasonal movement of animals from one region to another.

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The changing of the structure of a gene.

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The process where organisms adapted to environment tend to survive and produce more offspring.

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Variation: Mutation
Inheritance: DNA and sexual selection
Selection: Selection and Genetic Drift
Time: Migration/Gene Flow