For a population's growth rate to be zero

A. no births can occur
B. the average number of births and deaths must be the same
C. more deaths than births must occur
D. more births than deaths must occur

B. If there is one person who dies for every person that is born then there is a 0% difference in the population. If it were A, then population would be declining. If it were C then it would be declining as well. If it were D it would be increasing then. Answer is B.

Answer any resource, such as wood or solar energy, that can or will be replenished naturally in the course of time;