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1. The trouble is that it is extremely difficult to be sure about radiation damage --a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of deformed children or even grandchildren. 2. In the end , only 7 out of 19 regular Cola drinkers correctly identified their brand of choice in all for trails. The diet-Cola drinkers did a little worseonly 7 of 27 identified all four sample correctly. 3. Taste is such a subjective matter that we dont usually conduct preference tests for food. 4. It seems simple enough to distinguish between the organism and the surrounding environment and to separate forces acting on an organism into those that are internal and biological and those that are external and environmental. 5. But in actual practice this system breaks down in many ways, because the organism and the environment are constantly interacting so that the environment is modified by the orgainism and vice versa . 6. In the case of man, the difficulties with the environment concept are even more complicated because we have to deal with man as an animal and with man as a bearer of culture. 7. If we look at man as an animal and try to analyze the environmental forces that are acting on the organism, we find that we have to deal with things like climate, soil, plants, and such like factors common to all biological situations; but we also find, always, very important environmental influences that we can only class as cultural, which modify the physical and biological factors. | 
