Final answer:
The heart and lungs are the most effective targets for a shot delivered to big game animals.
Step-by-step explanation:
The most effective shot to deliver to big game animals would depend on the objective of the shot. However, in terms of targeting vital organs for a quick and humane kill, the heart and lungs are the most effective areas to aim for. The heart shot is particularly effective as it can cause rapid blood loss and the animal would quickly lose consciousness and die. The lung shot is also effective as it can cause the animal to quickly lose breath and go into shock, leading to death.