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What Caused the Buildup of Oxygen in the Atmosphere at Roughly

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What caused the buildup of oxygen in the atmosphere at roughly 2.5 Ga?


Definitions:

Reves v. Ernst & Young

A significant court case that established a test for determining whether a transaction qualifies as a security under the securities laws.

Promissory Notes

Written promises to pay a specified sum of money to a certain entity or person at a specified time or on demand.

Howey Test

A test derived from SEC v. W.J. Howey Co. to determine if a transaction qualifies as an "investment contract" and thus is considered a security subject to certain regulatory requirements.

Investment Contracts

Agreements or schemes whereby an individual invests money with the expectation of profit primarily from the efforts of others.

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