Final answer:
Resuscitative efforts can be ceased by an EMT when spontaneous circulation and breathing occur.
Step-by-step explanation:
Once an EMT has begun resuscitative efforts, they may cease those efforts when spontaneous circulation and breathing occur. This means that the patient's heart is beating on its own and they are breathing without assistance. It is important for the EMT to continue monitoring the patient's vital signs and provide appropriate care until these signs of life return.