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Mass extinction Extinction is a continual product of natural selection since the dawn of competition spawned by the first meiosis event natural selection has altered all life on earth precariously engaging in life experiments some that work and some that dont Those experiments that do not work are those who have so far been extinct and in fact 99Kiernan 1996574 of all species that have ever engaged in the life battle have met their fate and are now extinct why does this happen what causes a species to be extinct and how if we can-- prevent it To answer these questions we must first define what extinction means what types are there and why do they occur Extinction some people define as the disappearance of a plant or animal from the wild Meaning that creatures surviving only in zoos or natural reserves could also be considered extinct Other people use the terms regional extinction and local extinction to refer to the elimination of a creature from a specific geog raphical area but not from the whole planetKiernan 1996 574 These types of extinctions are rather common and are usually caused by human intervention in the form of over hunting introduced competitors and destruction of habitat Another type of extinction refers to the very dynamic way nature interrelates where the extinction of one creature can lead to the extinction of another This phenomenon is known as co extinction Animals in the food chain depend on other animals for food thus when one animal becomes extinct those who prayed upon it must find other means of food if they are unable to do so their fate is surely written Another type of extinction deals with extinction caused by evolutionary change where through the process of speciation results in the development of a new speciesElliot 1998 2931 This type of extinction is not as devastating to the biodiversity on earth in that though we loose
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