Why is the Permian mass extinction event often referred to as an event where life almost died? What do scientists believe caused this event and why did it result in such a catastrophic loss of diversity? 
Definitions:
Dividend Yield Ratio
A financial ratio that shows how much a company pays out in dividends each year relative to its stock price.
Common Stock
A type of equity ownership in a corporation, representing a claim on a portion of its assets and earnings.
Market Price
The prevailing cost at which a commodity or service may be purchased or traded in a market.
Acid-Test Ratio
A financial metric that measures a company’s ability to pay off its current liabilities with its quick assets (cash, marketable securities, and receivables).
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