Evolution of cetaceans decreasing. Other historical climate events can be correlated and matched with the genome history of the Yangtze River dolphin as well. This shows how global and local climate change can drastically affect a genome, leading to changes in fitness, survival, and evolution of a species. The European population of common dolphins ("Delphinus delphis") in the Mediterranean have differentiated into two types: eastern and western. According to a 2012 study, this seems to be due to a recent bottleneck as well, which drastically decreased the size of the eastern Mediterranean population. Also, the lack of population structure between the western and
The Snow Creature the creature to create a cave-in (presumably to keep his family safe from the humans). However, the cave-in works against the Yeti, killing the female and young Yetis and knocking the snow creature himself unconscious. The cave-in also enables Parrish and Wells to take control of the sherpa’s guns. Having regained control over the expedition, and successfully capturing a live Yeti, Parrish declares that he is intent upon bringing the creature to the U.S. where it will be studied. The Yeti is eventually sedated and placed in a telephone booth-sized freezer for transport. Locked inside this freezer, the Yeti is