Final answer:
Increased reliance on seafood and plants led to people becoming more settled, transitioning from a nomadic hunter-gatherer lifestyle to one centered around agriculture and permanent settlements.
Step-by-step explanation:
Increased reliance on seafood and plants allowed people to become more settled and less nomadic. As humans transitioned from a hunter-gatherer lifestyle to an agricultural one, they started forming permanent settlements that allowed them to cultivate plants and domesticate animals. As it became possible to rely on a steady food source, there was less of a need to move with the seasons or follow the migration patterns of animals. This pivotal change led to the growth of civilizations, but also meant that humans became more vulnerable to the whims of climate and the environment, with a greater risk of food shortages or famine in the event of crop failure. The modern picture of a globalized food chain owes much to these ancient shifts toward agriculture and reliance on a narrower range of food sources.