Many things can cause a bleb to rupture, such as changes in air pressure or a very sudden deep breath. Often, people who experience a primary spontaneous pneumothorax have no prior sign of illness; the blebs themselves typically do not cause any symptoms and are visible only on medical imaging.
SEATO came to an end in 1977 after just 22 years of existence. Lesson Summary. After World War II, the United States and other countries were concerned about the spread of communism around the world. On Feb. 19, 1955, the Southeast Asia Treaty Organization (SEATO) was created to help combat this spread. Of the eight member countries, only two (Thailand and the Philippines) were actually located in Southeast Asia.
The primary goal of the North American Free Trade Agreement (NAFTA) was to? A. decrease illegal immigration. B. allow Canada and the United States to make low-interest loans to Mexico. C. reduce tariffs on agricultural products and increase trade between North American nations and the European Union.