The article says the forest and savanna "could degenerate into chaotic mutual encroachment." What does encroachment mean? A. to become filled with roaches
B. to hide behind something else
C. to dig a trench around something
D. to advance beyond the usual limits

Which layer will become saturated first when rain falls?

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above

What material did the moon come from?