What was the life of marco polo during the time of the mongol empire

Paragraph A: What comes from water but makes you thirsty? Salt. You may think those tiny crystals are no big deal. However, salt has been one of the most valuable minerals in the history of man.

Paragraph B: The human body needs salt to survive. Salt helps send nerve signals to and from the brain. Salt helps nutrients move around the body. It helps muscles work properly, and it aids digestion.

Paragraph C: In ancient times, you could not buy salt at the local store.

b.

one company controls all the means of production of a product.

~coco