Why cannot we draw C5H12 isomer as 2-ethyl butane?
please help me army only one brainiest
Answers
Answer:
Myself kritika kohli
age 15
from Nagpur
The primeval vegetation of Europe began to take shape as the climate ameliorated following the retreat of the Pleistocene ice sheets some 12,000 years ago. The microscopic study of pollen grains preserved in datable layers of peat and sediments has made it possible to trace the continental spread, in response to climatic improvement, of forest-forming trees. The double barrier of the Alps and the Mediterranean Sea had checked the southward retreat of trees at the onset of the ice ages, and there were relatively few indigenous species to return northward from unglaciated refuges. In the first postglacial climatic phase (the Boreal), spruce, fir, pine, birch, and hazel nevertheless established themselves as far north as central Sweden and Finland. During the succeeding climatic optimum (the Atlantic phase), which was probably wetter and certainly somewhat warmer, mixed forests of oak, elm, common lime (linden), and elder spread northward. Only in the late Atlantic period did the beech and hornbeam spread into western and central Europe from the southeast.
During postglacial times, therefore, when small numbers of humans were living within Europe, the continental surface was thickly clad with trees and undergrowth, except where tree growth was precluded by extreme cold, high elevation, bad drainage, or exposure to persistent gales. Even those areas where windblown loess was deeply deposited are now known to have had woods of beech, hawthorn, juniper, box, and ash, as did limestone plateaus. The Mediterranean peninsulas also had evergreen and mixed forests rooted in an ample soil.
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