I think its B.all the members of a population ate genetically very similar etc
With regards to gender differences in coping strategies, male is to female as fight or flight is to TEND AND BEFRIEND. Men and women have different strategies in coping with stress; men usually exhibit the fight or flight tendency while women exhibit the tend and befriend tendency.
Starfish has a endoskeleton
a coral has a exoskeleton
sponge has neither
Are you talking about the esophagus?