2. the additional income from selling one more unit of a good, sometimes equal to
price, is
a marginal revenue
b a variable
cincreasing marginal returns
dthe marginal product of labor
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Ответ:
Oxygen entered the Earth's atmosphere after the appearance of the Great Oxidation Event (Great Oxygenation Event). The Great Oxidation is the first mass extinction on Earth.
The Great Oxidation lasted 2.4 to 2.0 billion years ago.
Oxygen appeared on Earth thanks to cyanobacteria using photosynthesis.