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Basically because your skin has several layers to it (see link, below), and the layer that has the blood vessels capable of bleeding in it is further down than a superficial scrape would affect.
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Answer:
The nephron, the functional unit of the kidney, is responsible for removing waste from the body. Each kidney is composed of over one million nephrons that dot the renal cortex, giving it a granular appearance when sectioned sagittally (from front to rear).
Explanation:
Natural selection is the process through which species adapt to their environments
natural selection is the method through which populations of dwelling organisms and species adapt and exchange. individuals in a population are obviously variable, that means that they will be all unique in a few methods. this variation approach that some humans have trends higher suited to the environment than others. people with adaptive tendencies—traits that supply them a few advantage—are more likely to live to tell the tale and reproduce. those humans then pass the adaptive developments directly to their offspring. over the years, the ones powerful trends come to be more not unusual within the populace. through this machine of natural selection, favorable trends are transmitted through generations.
natural selection can cause speciation, in which one species offers rise to a brand new and rather precise species. it is one of the processes that drives evolution and permits to provide an cause of the sort of existence inside the world
Darwin selected the decision natural choice to contrast with “artificia selection,” or selective breeding that is controlled via human beings..
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The answer is; desertification
Topsoil is usually the riches soil in terms of nutrient is important in support of plant vegetation. It is rich because it contains humus and other decomposed materials that recycle nutrients. When the topsoil is washed away, the local region becomes barren in that it cannot support vegetation. This causes the area to turn into a desert.
