Failure of negative-feedback mechanisms to maintain homeostasis. a)may produce disease.. b)occurs when blood pressure increases during exercise.. c)can be corrected by stimulating positive-feedback mechanisms.. d)cannot be corrected by medical therapy.. e)all of these

Basically all of the choices given are failure of negative feedback mechanisms to maintain homeostasis. The correct option among all the options that are given in the question is the last option or option "E". I hope that this is the answer you were looking for and it has come to your help.

C. a mature ovule of a plant.