What type of population change would you expect to occur for monkeys in an undisturbed section of the Brazilian rain forest? 

A)  cyclic 
B)  stable 
C)  explosive 
D)  irruptive

In an undisturbed environment, the population of monkeys would typically reach a state of equilibrium, where the birth rate and death rate remain relatively constant, resulting in a stable population size over time. Cyclic population changes would imply regular and predictable fluctuations, which would be unlikely in a stable rain forest environment, while explosive and irruptive changes would suggest sudden and dramatic increases or decreases in population size, which would also be unusual in a steady ecosystem.