5. Why are practices such as shifting cultivation and pastoral nomadism potentially unsustainable in the future?
A)Population increases put pressure on the amount of land used
B)Government may interfere and limit the amount of land available
C)Commercial farming can generate greater amounts of food
D)Many of the younger generation are migrating from rural to urban areas
E)All the above

The great scientist alfred wegener proposed that continents have moved, while other scientists such as t.c.chamberlin argued against wegener. wegener's ideas eventually won, and are now widely accepted, because: a) wegener's ideas were more beautiful, and so were favored by the intellectual elite.b) wegener's ideas did a better job of predicting the results of new observations and experiments.c) wegener's ideas appealed to dead white european males, whereas chamberlin's didn't.d) wegener's ideas appalled dead white european males, and we all know that in this politically correct era,dead white european males cannot get a fair shake.e) wegener won the nobel prize.