Of the following, which is the most significant factor in causing strained border relations between mexico and the united states?

mexico is the largest foreign supplier of marijuana and methamphetamine to the us market

abundant rainfall in recent years along much of the mexico-us border region has ameliorated periodically strained water-sharing relationships

mexico must deal with thousands of impoverished guatemalans and other central americans who cross the border looking for work

the us has intensified security measures to monitor and control legal and illegal transport of people and goods

Write down ten 10 ways in which you can pratice the ubuntu concept

Aresearcher proposes to conduct a study at a foreign site. the research has been determined to be exempt from the federal regulations by institutional policy. according to federal regulations, is review required at the foreign site? if a proposed study qualifies for exemption, federal regulations do not require review at the foreign site where it will be conducted but still require review at the u.s. site by the institution’s irb. if a proposed study qualifies for exemption, federal regulations do not require review at the foreign site where it will be conducted. if a proposed study qualifies for exemption, federal regulations do require review at the foreign site where it will be conducted. if a proposed study qualifies for exemption, federal regulations do not require review at the foreign site where it will be conducted, but still require review by the institutional official at the local site.

When zhang qin went to explore west, he brought back stories of