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In the Preceding 350 Years or So, There Have Been

question 51

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In the preceding 350 years or so, there have been at least four massive population shifts. The following example that most closely represents these massive shifts is the:


Definitions:

Depressed

A state characterized by feelings of severe despondency and dejection, often with lack of energy and difficulty in maintaining concentration or interest in life.

Essential Oils

Plant extracts that are highly concentrated and maintain the original aroma and taste, or "essence," of the plants they come from.

Degenerative Joint Disease

Also known as osteoarthritis, a type of arthritis that occurs when the cartilage that cushions the ends of bones in the joints deteriorates over time.

Eucalyptus

A diverse genus of flowering trees and shrubs, many of which are known for their aromatic leaves and are used in medicinal preparations.

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