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orgns are preserved because other persons will make use of it that's why it's preserved.
He preserved food by pasteurization .
A fossil is any trace of an organism preserved in a rock.
freeze it.
Pompei
plato
They preserved ancient Greek and Roman writings by copying them in their Scriptoriums.
it preserved Roman ideas.
It,should be preserved at any cost
Lenin's writings were based mostly on the ideas that capitalism was an oppressive system to the workers, that the workers should revolt against their employers, that socialism should be imposed upon the country in p lace of capitalism. In other words, his writings were based mainly on Marxist ideas.
Socrates said his ideas came from his teachers.
their translation of ancient Greek writings preserved ancient knowledge
He researched it.
Here you will find your answer: http://books.google.pl/books?id=SPvsph6TNYAC&pg=PA16&dq=%22Philo%E2%80%99s+writings%22#PPA18,M1
Aristotle was Alexander's tutor for a period.
Secondary source
It was Charlemagne. He did not collect Roman writings. He commissioned monks to transcribe them. As a result copied manuscripts of Roman writings were scattered around the monasteries of much of western Europe. He did not do so with Greek writings. Knowledge of Greek had been lost, so the monks could not transcribe them. Greek writings were preserved in Greece.