D. Civilizations is the correct answer
The thyroid gland regulates the rate of the body metabolism.
Matter at the bottom of a glass of water is called a substance.
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The purpose of the Truman Doctrine was to...
To keep communism from spreading into more countries
After World War II, the fear of communism spreading to other countries overtook America and as a result, president Harry Truman announced the Truman Doctrine; a doctrine that declared that any countries that were under threat from any external or internal authoritarian forces would be provided with political, military, and economic aid if needed.