The Most Likely Source of Early Earth's Atmospheric Oxygen Was

question 119

Multiple Choice

The most likely source of early Earth's atmospheric oxygen was

• A) volcanic eruptions.
• B) lightning striking water vapor.
• C) the spontaneous breakdown of fatty acids.
• D) photosynthesis by ancient cyanobacteria (blue-green algae).
• E) the decay of fossil organisms.

---

Definitions:

Simple Rate

A basic or straightforward interest rate that is applied to an amount without compounding over a time period.

Investment

The allocation of resources, such as capital or time, with the expectation of generating a future return.

Present Value

The current value of a future amount of money, calculated using a specific interest rate to account for the time value of money.

Annual Cash Operating Costs

Refers to the total amount of cash expenditures that a business incurs within one year to maintain its operations excluding non-cash expenses.