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【正文】 s early atmosphere Accept reference to Venus’ present atmosphere 2 Total 5 。s early atmosphere ?There may not have been ( continuous) lightning ?Miller and Urey selected only the gases needed to produce amino acids Ignore small scale / timescale Ignore references to water / oceans or other theories Accept these gases / hydrogen / methane/ ammonia may not have been in the Earth39。/ algae photosynthesise / absorb / use carbon dioxide Accept carbon dioxide bees locked up in sedimentary rocks / carbonates/ limestone Or Precipitation or formation of insoluble carbonates Accept remains of plants / algae / marine anisms contain locked up carbon dioxide / carbon in the form of fossil
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