Movement of people wihtin their country, such as moving from one city to another.

migration is the word

/the trachea, commonly known as the windpipe

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.