African rivers have limited navigability because they frequently ...

[azncindy619]

African rivers have limited navigability because they frequently are interrupted by falls and rapids.
 
  Indicate whether the statement is true or false

Question 2

During old-field succession, the graph clearly shows that the number of species increases with time. During what period of time is this rate of increase the greatest?
 
  A) 0-20 years
  B) 60-100 years
  C) 40-60 years
  D) 20-40 years
  E) cannot be determined from this data

[Brenm]

Answer to Question 1

TRUE

Answer to Question 2

A