Final answer:
Passive euthanasia involves ceasing therapies that prolong life, ultimately resulting in death. It can be voluntary or nonvoluntary, depending on the patient's consent.
Step-by-step explanation:
Passive euthanasia involves ceasing therapies that prolong life so that death can occur. It is a form of euthanasia where treatment is withheld or withdrawn with the expectation that a patient will die sooner than they would with continued medical intervention. This can be done with the consent of the patient (voluntary passive euthanasia) or without their consent (nonvoluntary passive euthanasia).