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Which of the Following Is True of the Customs Unions

question 37

Multiple Choice

Which of the following is true of the customs unions in South America? 


Definitions:

Autoimmune Disease

Disorders caused by the immune system mistakenly attacking the body's own cells, tissues, and organs.

MHC Proteins

Major histocompatibility complex proteins; cell surface proteins important for the immune system to recognize foreign molecules in vertebrates.

Capillaries

The smallest blood vessels in the body's circulatory system, responsible for the exchange of gases, nutrients, and waste materials between the blood and tissues.

Oxygen

A chemical element with symbol O, essential for most life forms on Earth, crucial for cellular respiration in animals.

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