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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 ...
An example is the production of tetrodotoxin in the rough-skinned newt and the evolution of tetrodotoxin resistance in its predator, the common garter snake. In this predator-prey pair, an evolutionary arms race has produced high levels of toxin in the newt and correspondingly high levels of toxin resistance in the snake.
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.
c. 1000 BC – Cherchen Man was laid to rest with a twill tunic and the earliest known sample of tartan fabric. [7] c. 200 AD – Earliest woodblock printing from China. Flowers in three colors on silk. [8] 247 AD – Dura-Europos, a Roman outpost, is destroyed. Excavations of the city discovered early examples of naalebinding fabric.
In biology, evolution is any change across successive generations in the heritable characteristics of biological populations. Evolutionary processes give rise to diversity at every level of biological organization , from kingdoms to species , and individual organisms and molecules , such as DNA and proteins .
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.
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 ...
In biology, evolution is the process of change in all forms of life over generations, and evolutionary biology is the study of how evolution occurs. Biological populations evolve through genetic changes that correspond to changes in the organisms ' observable traits .