In the beginning, wo/mankind were nomadic hunters and gatherers. They did not fence themselves in, did not build houses or work the field for agricultural cultivation. They moved from place to place, scavenging whatever they found along the way: weeds, grains, caryopsis, leaves, roots and fruit. Each season introduced additional crops, and people moved according to the weather, just like the migrating birds which spend their winters in warmer climates and escape the heat by drifting to cooler placer in summer. Seeds of grains, fruit and hard roots which can be stored for longer periods of time were sometimes preserved in preparation of harsh winters.

As people began settling down, they domesticated plants and animals by gathering the plants they enjoyed (not too bitter or toxic) closer to them to grow and cultivate. The earth surrounding their houses became rich in nitrogen, generated by animal and human wastes, which enriched the earth to make it extra-perfect for agriculture. Over time, human beings discovered the secret of plant reproduction: if you keep the seeds yielded by the crop, you can replant them in the soil and grow a new plant. The seeds from the more successful crops were kept from season to season, also according to their use – those with extra-large leaves, a big root or fruit; those tastier than others , sweeter or stronger flavored, and those which demonstrated strength and durability in face of pests and weather hazards. Thus humankind naturally, albeit with some intervention, developed species better adapted for his/her needs and uses