"the great migration" of the 20th century could best be described as

a) the waves of immigrants from eastern and central europe
b) a movement of southern african americans to the west and north
c) a mass movement of political refuges from asia
d) the political refuges from cuba and latin america

B. A movement of Southern African Americans to the West and North.

this statement is true.

forests are public goods, available for everybody. when usage of such a good becomes interesting for consumers and its usage increases, there can be a risk of overexploitation. it is a non rival good therefore, if one person consumes the good it does not reduce the availability for subsequent consumers.

these caracteristics require the establishment of measures in order to prevent the destruction of a commonly owned space, for example, to restrict the amount of people that have access to the same time.

this can !    

- jack watson