One can think of a number of reasons for our survival, but I think the greatest reason of them all is our adaptability. Human beings are extremely adaptable to any situation and this, coupled with our technological advances, gives us an edge over other species and ensures our survival.
An example is a natural disaster, say a flood. A devastating flood will undoubtedly cause significant loss of infrastructure, crops and lives. However, we can use chemicals to fertilize our crops, make new homes and infrastructure very quickly using large machines and provide alternate employment to people. Our medicinal advances can make sure that loss of life and spread of infection is minimal.
We have adapted to survival in various extreme conditions, whether it is desert or poles (North and South). We can also keep astronauts alive in space for a year or more.
Thus, our adaptability ensures our survival and provides us a significant advantage over other species.
Hope this helps.
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