What is the implication of having oxygen-producing organisms evolve earlier than hypothesized?

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Related questions

The buildup of oxygen in the atmosphere due to cyanobacteria on early earth likely caused organisms to evolve mechanisms to deal with this harmful gas. One of the mechanisms, which is considered to be a feature of the last common ancestor, is aerobic respiration primarily occurring in the ________.

A.chloroplasts
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C.nucleus
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1.All living organisms alive today are assumed to have evolved from some one-celled ancestor that lived about four billion years ago and has been called the Last Universal Common Ancestor or LUCA. LUCA has been extinct for a long time but evolutionary biologists have hypothesized as to what it was like. Given the characteristics of modern prokaryotic and eukaryotic organisms, what cellular characteristics would you suggest that LUCA had? What type of cellular respiration might LUCA have used? Why?

2. Why is water so essential for biological life? Provide examples as to how water is used in living systems.

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