Basic Agriculture Emerged as a Viable Subsistence Method Around

question 20

Multiple Choice

Basic agriculture emerged as a viable subsistence method around:

• A) 1,000 years ago.
• B) 500 years ago.
• C) 10,000 years ago.
• D) 50,000 years ago.
• E) 75,000 years ago.

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Definitions:

Synthesize

The act of chemically uniting simple elements to produce a substance that is more complex.

Ether

A class of organic compounds characterized by an oxygen atom connected to two alkyl or aryl groups, typically used as solvents or in the synthesis of other chemicals.

Ether

A class of organic compounds that contain an oxygen atom connected to two alkyl or aryl groups, used as solvents and anesthetics.

Chemical Shift

A measure of the change in resonant frequency of a nucleus in a magnetic field due to its electronic environment, important in nuclear magnetic resonance (NMR) spectroscopy.