The kidney, in its various stages of evolution, functions at the expense of considerable metabolic energy and cannot be considered to be a passive system.
Nature has a funny way of casting off distractions from mating through evolution – even at the expense of an individual's health.
This is because the acceptance of Darwin's theory of evolution was at the expense of the ideas of the French philosopher René Descartes, who held that there is a rigid distinction between man, who has a soul and can think and speak rationally, and all other animals, who are mere automatons.
Many remnant populations in these regions are small and isolated, harbouring lower levels of genetic variation and more likely to be affected by nonadaptive evolution through random genetic drift at the expense of adaptive change by natural selection (Ellstrand and Elam 1993).
However, recent research - exemplified by the Mexican cavefish (Astyanax mexicanus) - points rather to the evolution of 'constructive' (without wanting to imply teleological evolution), useful characters that arise, possibly at the expense of adaptations for life on the surface [ 2].
Many recent studies that relax the assumption of independent evolution of sites have done so at the expense of a drastic increase in the number of substitution parameters.
Wrinkles learns that mutations that occurred during the evolution of cavefish favored more taste receptors at the expense of eyes, and this is probably the reason why cavefish lost their eyes during evolution.
A slight improvement in the overall performance of the system is observed in the course of replicase evolution: the total number of replicators increases at the expense of empty sites.
But hunters that specialize on ants or have poor vision could spur the evolution of other traits, such as fast running, at the expense of exact mimicry.
The innovations supposed an evolution in the shape of masonry arch bridges, at the expense of increasing the thickness of voussoirs and vault.
