In considering possible explanations for this finding, the researchers dismissed demographic bias because older individuals were not overrepresented in the fossil samples.
... because older individuals were not represented more that the actual distribution of the species so as to cause mis-calculation. For example, if there should be only 20% older individuals (dinosaur, isn't?) but if the collection of fossil samples somehow contains 40% older ones. The result will be distorted.
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发表于 2003-12-9 23:46:00
