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- adjective Of, pertaining to, or resulting from
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FFE systems can produce fluctuational spikes or excursions that might be very large or very small compared to their recent dynamical history, because the quasi-periodicity of the multiple underlying processes can produce random-seeming beats.
First we must, as de Vries has shown, distinguish real, genetic, variation from _fluctuational_ variations, due to environmental and other accidents, which cannot be transmitted.