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For the next 30 years, smaller spatial quakes plague the world on an irregular basis.
In the present, Shido Itsuka, a seemingly ordinary high school student comes across a mysterious girl at the ground zero of a spatial quake.
Several animal groups have undergone aquatic adaptation, going from being purely terrestrial animals to living at least part of the time in water.
The adaptations in early speciation tend to develop as the animal ventures into water in order to find available food.
The arc of their adaptation is evident by observing the primitive Laticauda genus, which must return to land to lay eggs.
These marine reptiles had ancestors who moved back into the oceans.
Archelon is a type of giant sea turtle dating from the Cretaceous Period, now long extinct.The cetacea are extensively adapted to marine life and cannot survive on land at all.Their adaptation can be seen in many unique physiognomic characteristics such as the dorsal blowhole, baleen teeth, and the cranial 'melon' organ used for aquatic echolocation.As successive generations spend more time in the water, natural selection causes the acquisition of more adaptations.