Scientists have hypothesized that oxygen began to build up in the Earth's atmosphere after the development of living things with the ability to A. breathe air. B. form tissues. C. photosynthesize. D. reproduce

Scientists have hypothesized that oxygen began to build up in the Earth's atmosphere after the development of living things with the ability to A. breathe air. B. form tissues. C. photosynthesize. D. reproduce sexually.

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Scientists have hypothesized that oxygen began to build up in the Earth's atmosphere after the development of living things with the ability to A. breathe air. B. form tiss…

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