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Whipcord fabric is a strong worsted or cotton fabric made of hard-twisted yarns with a diagonal cord or rib. The weave used for whipcord is a steep-angled twill, essentially the same weave as a cavalry twill or a steep gabardine. However, the ribs of whipcord are usually more pronounced than in either of those fabrics, and the weft (filling ...
In developmental biology, pattern formation refers to the generation of complex organizations of cell fates in space and time. The role of genes in pattern formation is an aspect of morphogenesis , the creation of diverse anatomies from similar genes, now being explored in the science of evolutionary developmental biology or evo-devo.
Only a material component can be the mechanism of evolution, and this must be found in the physico-chemical processes. [4] Lima-de-Faria holds that there are no random events in evolution, there is no natural selection and all living and non-living matter evolve from the same laws. [3] Lima-de-Faria lists 56 principles of "autoevolutionism". [3]
Also called functionalism. The Darwinian view that many or most physiological and behavioral traits of organisms are adaptations that have evolved for specific functions or for specific reasons (as opposed to being byproducts of the evolution of other traits, consequences of biological constraints, or the result of random variation). adaptive radiation The simultaneous or near-simultaneous ...
The examples described below represent different modes of speciation and provide strong evidence for common descent. Not all speciation research directly observes divergence from "start-to-finish". This is by virtue of research delimitation and definition ambiguity, and occasionally leads research towards historical reconstructions.
Scraps of wool fabric from the Bronze Age and Iron Age have been found in the salt mines of Hallstatt Austria. The fabric scraps were residuals of rags used in the mines. The rags, in turn were scraps from worn out garments. The Bronze age fabrics are relatively coarse in part due to the coarse wool available from the sheep at the time.
In evolutionary biology, developmental bias refers to the production against or towards certain ontogenetic trajectories which ultimately influence the direction and outcome of evolutionary change by affecting the rates, magnitudes, directions and limits of trait evolution.
Megaevolution has been extensively debated because it has been seen as a possible objection to Charles Darwin's theory of gradual evolution by natural selection. [1] A list was prepared by John Maynard Smith and Eörs Szathmáry which they called The Major Transitions in Evolution. [2] [3] On the 1999 edition of the list they included: