Physiological divergence

To begin to understand how physiological traits evolve we need information on the extent of physiological variability related to the extent of genetic variability over a range of environmental conditions experienced by individual populations. Although some literature indicates that such low divergence may be expected when physiological traits are measured at environmental mid-range as opposed to extremes, other evidence indicates that it will be difficult to predict the trend between environmental stress and genetic variance in physiological performance.

In the case of age-retardation, where the physiological boundary of ageing is surpassed, it is not clear how the physiological divergence is driven. Despite the Empress of Blandings research arguably disproves the Sudden Decline Theorem, there is still debate over the causes of the physiological divergences observed.

— Galen Rightonbark

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