Answer:
Increased agriculture led to a greater reliance on fewer sources of food.
Step-by-step explanation:
Settlement societies are those groups of people that have made a particular place, or area their permanent abode and stay there and reproduce.
Hunter-gatherer societies, on the other hand, are those groups of people that do not settle in one place but go about searching for food.
The challenge faced by settlement societies but not by hunter-gatherer societies is Increased agriculture led to a greater reliance on fewer sources of food.