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They eventually evolved into the first recorded aquatic form of dolphins, which were 60 foot/ 18 meter long animals. These animals lived around 38 million years ago.

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They are Adontocetes, meaning toothed whales.

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It's current form has existed for 10-15 million years ago.

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Nearest living relative on land may be the hippo.

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May have looked like big dogs.

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Evolved from hoofed. land-living mammal called the "Mesonyx" that returned to live in the seas about 50 million years ago.

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Evolved from animals that lived on land.

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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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A largely discredited biological hypothesis that the development of the embryo of an animal, from fertilization to gestation or hatching

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The muscles of the ear, wisdom teeth, the appendix, the tail bone, body hair, and the semi lunar fold in the corner of the eye

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When very different animals have bones that appear very similar in form or function and seem to be related.

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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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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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Factors such as environment and predication pressures can have different effects on the ways in which species exposed to them evolve. shows the three main types of evolution.

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any movement of individuals, and/or the genetic material they carry, from one population to another.

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A change in the genes of a plant or animal that causes physical characteristics that are different from what is normal

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The process by which forms of life having traits that better enable them to adapt to specific environmental changes.

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Variation
Inheritance
Selection
Time