Final answer:
Cultivation or artificial selection is the human manipulation of a plant species to enhance or ensure production.
Step-by-step explanation:
The human manipulation of a plant species to enhance or ensure production is known as cultivation or artificial selection. Humans have been practicing cultivation for thousands of years, starting with the collection and planting of seeds from plants with desired traits. Through the process of cultivation, plant species have been genetically modified by humans to have traits such as larger seeds, disease resistance, and better nutritional value.