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Machias uses offensive uprising to top Waldo County at states

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Did Earth's early rise in oxygen help multicellular life evolve?


Credit: NASA
Scientists have long thought that there was a direct connection between the rise in atmospheric oxygen, which started with the Great Oxygenation Event 2.5 billion years ago, and the rise of large, complex multicellular organisms.
That theory, the Oxygen Control Hypothesis, suggests that the size of these early multicellular organisms was limited by the depth to which oxygen could diffuse into their bodies. The hypothesis makes a simple prediction that has been highly influential within both evolutionary biology and geosciences: Greater atmospheric oxygen should always increase the size to which multicellular organisms can grow.
It s a hypothesis that s proven difficult to test in a lab. Yet a team of Georgia Tech researchers found a way using directed evolution, synthetic biology, and mathematical modeling all brought to bear on a simple multicellular lifeform called a snowflake yeast . The results? Significant new information on the correlations ....

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