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Within seven years, about 90 per cent of a human body is replaced as new.

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Because of changes in the genetic material (mutations) these have new characteristics and in the course of their individual lives they are tested for optimal or better adaptation to the environmental conditions. Immortality would disturb this system--it needs room for new and better life. This is the basic problem of evolution.
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In principle, it is possible for a biological system to become older without ageing.
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