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The whale evolved from a land animal. As the whale evolved the legs got shorter and the tail got stronger and bigger. At first the animal had a freshwater aquatic habitat, and evolved to have a saltwater habitat. As it evolved the hind legs shortened and eventually were not existent anymore. The nasal opening moved to the blowhole and baleen was formed for filtering food. They evolved over 50 million years ago. The whale probably evolved because of the struggle to find food.

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the process of change in the sequence composition of cellular molecules like DNA or 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 rudimentary structure in humans corresponding to a functional structure or organ in ancestral animals

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an organ or bone that appears in different animals, underling anatomical commonalities descending from a common ancestor

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variation in the relative frequency of different genotypes in a small population

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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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the development of a similar trait in related but distinct species, descending from the same ancestor

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movement from one part of something to another

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the changing of the structure of a gene resulting in a variant form that can be transmitted to other generations

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Differential survival and reproduction of individuals due to different phenotype.

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Variation
Inheritance
Selection
Time