There is reason to believe that all hierarchic groups, at some time in their history, had abundant food. Water provided the food in some cases: fish migrated into the streams near them; the open sea offered large fish. Land in other cases: herds of bison ran in the nearby fields. What is the reason to believe that all hierarchic groups had abundant food?
1) Water provided the food in some cases
2) Fish migrated into the streams near them
3) The open sea offered large fish
4) Land in other cases