A, if ten indicates the external O2 concentration, Y indicates the CO2 release, curve A indicates that CO2 rises continuously with the increase of external oxygen concentration, which means that this is aerobic respiration, while curve B indicates that the CO2 release decreases gradually with the increase of external oxygen concentration, which means that this is anaerobic respiration, because the existence of oxygen will inhibit anaerobic respiration; Correct.

B. If ten indicates that the blood sugar concentration and blood sugar content increase after eating for a period of time, the amount of insulin secreted by islet B cells increases, and the amount of glucagon secreted by islet A cells decreases, then A is insulin and B is glucagon; B correct.

C, if ten represents auxin concentration, y represents physiological function, and roots are more sensitive to auxin, then A is the promotion of stems and B is the promotion of roots; C error.

D, the more complex the community structure in the ecosystem, the stronger the resistance stability and the weaker the resilience stability, so if ten represents the complexity of the community in the ecosystem and Y represents stability, then A represents resistance stability and B represents resilience stability; Correct.

So choose: C.