According to the following figure, about how long ago did oxygen reach its current abundance in Earth's atmosphere? 
Definitions:
Modern Economy
Characterizes economies that are highly industrialized and usually have a significant reliance on technology and service sectors.
Specialization and Exchange
This concept depicts how individuals, firms, and nations can increase their productivity through specialization in tasks they perform best and exchanging their outputs for other goods and services.
Modern Economies
Economic systems that are characterized by dynamic industrial, technological, and service sectors, often with complex financial and regulatory frameworks.
Specialization
Specialization refers to the process of focusing effort and resources on the production of a particular product or a limited scope of products, leading to increased efficiency.
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