What are the different types of federalism? which one applies to our government today?

Why does the blending of many different diciplines present both challenges and opportunities to enviromental scientist?

This is an ap world history question. i am working on a worksheet which has a vent diagram with each circle labeled either us or byzantine economy. the middle is the similarities. can someone explain to me the similarities and especially the differences between the two?

Why is age an important determinant in decisions regarding migration? a. age influences the ability of migrants to adapt to new cultures. b. older migrants are more likely to move in search of work. c. age influences the likelihood that host nations will accept an immigrant. d. young adults are unlikely to move far from their families. e. older migrants are more likely to move far from their families.