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that many organisms living today are probably descended from ancestors that survived considerable, and sometimes rapid, climate change. Therefore, they should have inherited from their ancestors some degree of effective physiological and behavioural mechanisms for coping with certain ranges of climate variation. Over the last 15 years, a large number of studies showing a correlation between global climate change and changes in biological phenomena have been published Harrington 1999; and many others. McCarty noted that most such studies are based on anecdotal observations or correlations, rather than on definitive proof of causality. Indeed, it is difficult to determine a causal relationship between an event like a local temperature change and, for instance, a species extinction, because multiple environmental variables are likely to interact. Additionally, longterm records of geographical ranges, lifehistory phenology, etc. of most organisms do not exist with which to identify any biological impacts that may be correlated historical climate shifts. Because of the difficulty in establishing cause and effect, it is likely that some published studies

i served my country for my childrens future and id fight again for the right of my grandchildren for memorial day shirt 1
i served my country for my childrens future and id fight again for the right of my grandchildren for memorial day shirt 1

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