Back in Paleolithic times, people got their food by hunting and gathering. However, this was not a dependable food supply, was dangerous, and their food grew scarce if they stayed in one area for too long.
I must hunt these animals to eat tonight. Wait, look! There is plants that I can gather too!
Back in Neolithic times, people were beginning to use agriculture, which is farming and domesticating animals. This created a stable food supply, and is considered one of the most important inventions in history.
Looks like it's time to harvest the crops! I also need to milk the cow, but first I can use that mule to help me haul the crops.
Today, we can go to a grocery store to get food instead of farming or hunting our own.
Time to check out. Then I can go home to cook dinner.