Final answer:
Gary should visit the middle latitudes to see the fall leaves change color because these regions have the seasonal changes that lead to colorful autumn foliage, unlike the North Pole, South Pole, or equator.
Step-by-step explanation:
If Gary wants to see fall leaves change color, he should take a trip to the middle latitudes.
This is due to the fact that the middle latitudes experience distinct seasonal changes, with leaves typically changing colors during the autumn season. In contrast, the North Pole and South Pole do not have the same type of vegetation or seasonal cycles that produce fall foliage. The regions near the poles experience extreme daylight variations and cold temperatures that are not conducive to the growth of deciduous trees, which are responsible for the vivid fall colors. Similarly, the equator has a tropical climate with limited seasonal variation and is not known for fall leaf color changes.