How Did the Presence of Cyanobacteria on Earth in the Past

question 83

Multiple Choice

How did the presence of cyanobacteria on Earth in the past enable the later appearance of more advanced life-forms, such as humans?

• A) They absorbed harmful chemicals, making the air safer.
• B) They initiated the oxygenation of the atmosphere.
• C) They fertilized the soil to let plants grow.
• D) They increased the carbon dioxide in the atmosphere, causing the greenhouse effect.
• E) They "ate" plants, creating the first digestive systems on Earth.

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Definitions:

Capital Investment Analysis

The process of assessing the financial viability of a long-term investment project or proposal, evaluating potential returns and risks.

Money

A medium of exchange that facilitates trade, typically issued by a government as legal tender.

Salvage Value

The anticipated market value of an asset at the conclusion of its serviceable lifespan.

Net Present Value

A method used in capital budgeting to evaluate the profitability of an investment or project, calculating the difference between the present value of cash inflows and outflows.