The Geologic Time Scale Is Often Subdivided on the Basis

question 29

Multiple Choice

The geologic time scale is often subdivided on the basis of ____.  

• A) the appearance of different radioactive isotopes in different strata
• B) levels of background extinction
• C) periods of extensive environmental change
• D) the appearance of new species
• E) climate change

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Definitions:

Physical Flight

An escape or avoidance reaction in response to perceived danger or threat, characterized by a physical departure from the situation.

Fugue

A rare psychiatric disorder characterized by reversible amnesia for personal identity, including the memories, personality, and other identifying characteristics of individuality.

Comorbidity

A situation where a patient is simultaneously affected by more than one disease or medical problem.

Personality Disorders

A group of mental health conditions characterized by unhealthy patterns of thinking, functioning, and behaving.