How many muslim countries are there in the world?

Eter lives in a beautiful region. peter and other residents of his region use water from the river that flows through their region. recently, mark industries decided to set up their chemical plant near that river. peter realized that the waste from the chemical plant would pollute the river. he decided to seek a legal ordinance that would restrict the use of land near that river for specific use only. which type of zoning will peter and his region?

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Why are the majority of the world's economies mixed? what may happen to the "pure" types of economies (traditional, socialist/command, market capitalist) when they incorporate elements from other economic models?