What characteristics that germany, usa or saudi arabia share with canda that make them attractive for immigrants? (plz answer asap thxin advance)

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite

Agricultural practices in the united states nearly led to the extinction of the peregrine falcon during the 1950s and 60s.

What are economic benefits of building dams