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Whales migrate to eat and breed mostly. Whales cannot gibe birth in colder temperatures of water so they travel to warmer waters, Where as the other whales migrate seasonally.

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Scientists have found that a genetic mutation in the eyes of right whales that interfered with their ability to see in bright light may make them more susceptible to fatal knots in fishing gear, one of the major causes of death for this critically endangered mammal.

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The first whales to evolve was over 50 million years ago. 

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The first whales to evolve was over 50 million years ago. 

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Evolution by natural selection is said to be of the most substantiated theories in science history. Natural selection can cause small changes such as population size or color over times. But it can also completely change a species. Random genetic changes caused one whale to have its nostrils back further than usual. Which caused later generations to have nostrils back further on the head. As shown in the image below.

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In some whale species the behavior of them may be affecting the course of genetic evolution. In a study a scientist found that the mitochondrial DNA which is only inherited from the mother, implied that groups of whales with about the same calls are related

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Variation may be shown in physical appearance, metabolism, behavior and more. With whales, the larger ones each plankton, the medium sized ones feed on plankton and the smaller ones dine on fish. Their body features such as snout length can fluctuate within the still interbreeding members f the whale kind.

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The ontogeny of whales shows that there was a past when whales that are now aquatic used to be land walking creatures.

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DNA suggests that whales are descended from hoofed mammals and fossil records appear to a document a transition of four-limbed whales to modern species that only have four limbs.

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Divergent, Parallel, and Convergent Evolution:

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Divergent, Parallel, and Convergent Evolution:

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Whales, cats, bats and humans all obviously cannot interbreed and are definitely 4 different species, but their bone structures in their forelimbs show that they once diverged from a common ancestor. The way that toothed whales and bats echo locate is amazing, which is an example of convergent evolution.

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Bow head whales have highly adapted to the sea ice.

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Whales have a number of vestigial organs that would've been functional to their land living ancestors. Their pelvic girdle and the hind limbs of the finger muscles are just a couple examples.

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There was a new study that showed the cetacean bones that are found in the body structure of dolphins and whales are most likely influenced by forces of sexual selection. Sexual selection can also affect the internal anatomy that's controlling the genitalia.

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The flipper of a whale and the wing of a bat are very similar which demonstrates that there is some sort of ancestry between them.

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Evolution is change over time.

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Period 2.

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Variation
Inheritance
Selection
Time