For photosynthetic organisms to evolve and become more abundant than chemosynthetic organisms, what variable must have changed in the environment of ancient earth? carbon dioxide must have become more abundant. nitrogen must have become more abundant in the atmosphere. oxygen must have become more abundant. endosymbiosis needed to occur between a smaller prokaryote and a larger prokaryote.
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For photosynthetic organisms to evolve and become more abundant than chemosynthetic organisms, what...
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