It is estimated that a flock of wood buffalo crane should be able to sustain an r of 0.085 for the foreseeable future. if the flock currently contains 350 individuals, how long will it take for that population to double?
a. more than 13 years
b. between 11.0 and 13.0 years
c. between 9.0 and 11.0 years
d. between 7.0 and 9.0 years
e. less than 7 years