According to Islamic Empire Cultural Achievements, “Islamic scientists were among the first to study and chart the movements of planets and stars, eclipses and the rotation of the Earth ...they were able to pinpoint their exact location on earth. This proved to be helpful for the Muslim daily ritual of prayer, facing toward Mecca

every society, in order to meet the needs of it's people, has to answer three basic questions:

- what should we produce?

- how should we produce it?

- for whom should we produce it?

this questions must be answered in order to, option b, aid in production decisions.

every country can't produce everything, no matter how rich their land is. it may be a matter of technology, resources or geographical conditions. so, these three questions must be resolved in order to get the most of the production of each land.

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modern american cars are not available due to trade restrictions

a bad leader