By Jacques Monod
Ensayo sobre los angeles filosofía average de l. a. biología moderna publicado originalmente en 1970 por Jacques Monod, Premio Nobel de Medicina en 1965. Este biólogo francés formuló el teorema de que, si en cualquier proceso se suprime los angeles notion de finalidad, las cosas suceden por una combinación de azar y necesidad.
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This mixedgrass steppe transitions from tall grasses prairie parkland at the eastern edge to shortgrass steppe at about the 104th meridian. 25 m; the short grasses such as blue grama, hairy grama and buffalo grass to half a meter. Trees are rare except for cottonwood along the watercourses. A number of forbs grow in this ecoregion from Canada to Oklahoma: match weed or broomweed, scurf-pea, sunflower, goldenrod, and ragweed. The description of the Great Plains ecoprovinces given above, describes the vegetation of uncultivated lands of the region as they were originally.
Winters are cold and dry; summers are warm to hot. Average annual temperatures range from 14 to 18 C. Frost-free season ranges from 185 to 230 days. Precipitation ranges from 490 to 740 mm, most falling as rain. Vegetation changes from oak savannah on the eastern boundary to tallgrass prairie of bluestem-grama on finer textured soils through most of the region, changing to sandsage-bluestem on the coarser textures soils near the province’s western edge. • The Southwest Plateau and Plains Dry Steppe and Shrub Province (#315) covers much of west Texas and eastern New Mexico.
In a soil taxonomy used by the US Department of Agriculture before 1960 large portions of the Great Plains’ most productive soils, were labeled Chernozem because of their similarity to the Black Soils of the Ukraine and the more westerly drier soils were simply termed Brown. The classification system introduced in 1960 and employed since then by agencies of the US Department of Agriculture, uses a complicated set of descriptive terms drawn from Latin and Greek roots to classify soils2. Figure 2-6 shows the distribution of the dominant soil orders in the US and Canadian portions of the Great Plains.