The book Lectures On Biology was written by author Curt Thesing Here you can read free online of Lectures On Biology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Lectures On Biology a good or bad book?
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E. , carbon hydrogen, oxygen, nitrogen and sulphur or, iron, lead, gold and silver were decomposed into still more elementary substances. This fiery ball, continually emitting its heat into the icy space, continually lost warmth ; thus slowly but steadily the cooling process went on. Then came the time when the first chemical compounds came into existence, followed by the period of the formation of a strong earth-crust. Never- theless, we must assume that the temperature of the earth and the ga...ses surrounding it the atmosphere was at that time yet so high that water could only be present in the atmosphere in a gaseous form. The period of the formation of the earth-crust was probably followed by a very long waterless period. When afterwards, corresponding to the continued loss of heat, water became deposited on the solid earth-crust and when this primeval ocean had further cooled there were then at last present the conditions of the possibility of existence of organisms like those that exist to-day.
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