Explain the decreasing trend in HIV cases from the late 90's to 2016 (Site 1)

Which theory suggested that the earth was once a signle supercontient that gradually that broke up into the contients that we know today

Canada plays an important role in the global community in all of the following ways except by a. acting as a superpower with influence over europe and asia. b. promoting arms control and disarmament. c. working with the commonwealth of nations to promote trade. d. promoting trade with japan and other asian countries.

Alow-pressure belt means the air is cold and dry warm and rising cold and sinking warm and moist