Answer:Humanity has sustained itself across generations by means of advancements in technology. Since the primitive times such as the paleolithic era, humanity has always found ways to use natural resources and more products of nature in a way that they advance the then already known technology and further improves the quality of life and the way people live and thrive. As such, these advancements have led to the expansion into different facets of societal development and understanding, such as the scientific, political, and social aspects of life. Additionally, as this continuous demand for more advanced technology to cope with the times and competition further progressed, the technology followed. Society has also managed to sustain itself through social interaction. Social interaction is one of the many factors of humanity's development that significantly benefited from the advancement of technology. As early humans got close to each other, their blood eventually diverged to form the races and nationalities we know today and in history. With such a decentralized and widely spread system of social stratification and cultural, racial, national, and many more forms of identification, humanity has been able to properly sustain itself, much more so when they are under the leadership of people who can continue paving the way to the development of humanity and its current constituents all over the world.