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:
Research Cited
Refers to the process of acknowledging or referencing the work of others within your own scholarly or academic work to support your assertions.
Different Stages
Refers to the various phases or periods that a process, event, or development may pass through from beginning to end.
Physical Dependence
A physiological adaptation to a substance, leading to withdrawal symptoms when the substance is reduced or stopped.
Psychological Dependence
A form of dependence characterized by an emotional or psychological need for a substance or behavior, often lacking physical symptoms of withdrawal.
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