Biology
Biology, 25.12.2019 21:31, 3000517

Which of these would be evidence that cyanobacteria evolved the ability to perform photosynthesis and released oxygen as a byproduct over 2 billion years ago? a) the presence of iron oxides (rust) in sedimentary rock layers that are 2 billion years old b) the presence of an iridium-rich layer in sedimentary rock dating from times of mass extinctions c) the presence of chloroplasts in fossilized eukaryotes from fossils dating from 2 billion years ago forward d) the formation of stromatolite rock structures from aggregates of cyanobacteria dating 3.5 billion years ago

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