Research papers on chemistry. Racism today essay
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Another evolutionary concept is that all changes had mechanical reasons for happening (again, today’s science has ), and each mechanical change required some purpose in improving an organism’s chances of surviving to reproduce, or at least not have unduly impaired it. As evolution progressed, for each species, it was like taking a road, and the farther down the road a species went in its development, the “lifestyle” opportunities that its biological operation created precluded other kinds of styles. For instance, trees will never become . Trees went down the path of roots, , growing taller than their neighbors, and the like. A plant cannot choose locomotion as a way of life. It does not generate enough energy for it, for one thing. Animals went down a very different evolutionary path than plants did, and muscles, brains, livers, and the like have no analogy in plants and, by themselves, plants will not grow muscles or brains anytime soon, although humans have been making radical changes in animals over brief periods of time, such as the many breeds of dog.
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The nutrient cycling that life contributes to, and the oxygen that is generated that maintains the ozone layer, was all initially performed by prokaryotes, and will continue to be performed by them long after complex life goes extinct. Complex life is largely unnecessary for making Earth inhabitable. Microbes do not need them. Earth’s biomass today is about half prokaryote and half eukaryote.