Soil scientists use the capital letters O, A, B, C, and E to identify the master soil horizons<span>, and lowercase letters for distinctions of these horizons. Most soils have three major horizons: the surface horizon (A), the subsoil (B), and the substratum (C). Some soils have an organic horizon (O) on the surface, but such a horizon can also be buried. The master horizon, E, is used for subsurface horizons that have a significant loss of minerals (eluviation). Hard bedrock, which is not soil, uses the letter R.</span>
Answer:
i believe that the answer is sedimentation
Its stabilising. Since the selection pressure is against the extremes which are the normal blood and the sickle cell anaemia.
Either C or D. I think C, but I'm not too sure...
Answer:
The deposits truly depend on climate and the organisms from long ago that make fossil fuels <em>out of fossilized remains</em>. At that rate, the fuel will not be evenly distributed, rather split into some form of groups.
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