criticisms of life cycle concept?

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• 英语翻译Some persons say that love makes the world go round.Others of a less romantic and more practical turn of mind say that it isn't love; it's money.But the truth is that it is energy that makes the world go round.Energy is the currency of the ecological system and life becomes possible only when food is converted into energy,which in turn is used to seek more food to grow,to reproduce and to survive.On this cycle all life depends.
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• criticisms of life cycle concept?
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