overpopulation can lead to limited\nfood.\nim...

# Brief Explanations: Overpopulation means a large - number of people. With more people, the demand for food increases. Resources like land for agriculture may be limited, so food can become scarce. Immunity is related to individual health and the body's defense system, not directly caused by overpopulation. Poverty has multiple complex causes not solely due to overpopulation. Competition is a result but not as direct as food limitation. # Answer: food.