Trisha is learning how to do a first-aid procedure known as CPR. She is practicing using a mannequin, or a model of the top half of the human body. What is one limitation of a CPR mannequin?

it is not possible to check for a real pulse on a CPR mannequin

Explanation:

Based on the information provided within the question it can be said although extremely helpful, one limitation that CPR mannequins have is that it is not possible to check for a real pulse on a CPR mannequin. Being able to check the pulse of the victim is extremely important as it allows you to see how serious the victim's condition is and take appropriate measures.