The most important ethical concerns related to conflicts of interest in research are:

The most important ethical concerns related to conflicts of interest in research are the protection of the human subjects of the research and ensuring the objectivity in the research. 
The personal beliefs of a researcher should influence the results of the research. 

The correct answer is b

To solve their problems, mesopotamians used irrigation, a way of supplying water to an area of land. to irrigate their land, they dug out large storafe basins to hold water supplies these ditches brought water to the feilds. to protect their feilds from flooding, farmers built up the banks of the tigris and euphrates.hope ths !