b. The only function of fat in the body is to act as a source of potential energy.

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• Parks contribute to the quality of the urban environment. Fortunately it is no longer necessary that every lecture or every book about this subject has to start with the proof of this idea. (111) At present it is generally accepted, although more as a self-evident statement than on the basis of a closely-reasoned scientific proof. The recognition of the importance of greenery in the urban environment is a first step on the right way. (112) This does not mean, however, that sufficient details are known about the functions of greenery in towns and about the way in which the inhabitants are using these spaces.As to this rather complex subject I shall, within the scope of this lecture, enter into one aspect only, namely the recreative function of parks.

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