We can be sure that ancient civilizations knew of and were concerned about infectious diseases from several facts. The hunter gatherers rarely suffered from water borne diseases. They knew that the water that stank or did not taste well was not good to intake. Their main knowledge came from experience. During the Greek period several doctors like Alcmaeon of Croton were mentioned and hence they must have had the knowledge about infectious diseases like Cholera. Several other infectious disease treatment have also been mentioned during the Greek period.
the answer is 46, sorry if I am wrong. pls let me know!!
Answer: Improved commercial practices led to an increased volume of trade and expanded the geographical range of existing trade routes including the Silk Roads, trans-Saharan trade network, and Indian Ocean promoting the growth of powerful new trading cities. The Indian Ocean trading network fostered the growth of states.
Explanation:
B. marketplace, this is the only one where people buy and sell goods directly
