What's the main reason that the sex ratio is usually below 100? a. on average, men live longer than women. b. on average, women live longer than men. c. men are more likely to die in infancy. d. one hundred percent is a logical limit.

What's a recharge area? a. the part of an aquifer where groundwater meets a lake or stream b. the part of an aquifer where surface water reaches the water table c. the part of an aquifer that's located between two aquicludes d. the part of an aquifer that's located at a lower elevation