Exactly. Every strategic point in the evolution of each of the hominin species was triggered by necessity. And this necessity was borne out of the need to adapt to changes in their environment - just like the evolution of bipedalism, uprightness, tool manipulation and whatnot.

Evolution is a continuous process, and we haven't stopped evolving. Who knows, we could evolve with immortality (or at least to defy senescence; like the hydra), or maybe we could evolve to be multiplanetary. But in all these, the purpose of evolution is to ensure our survival.

Thanks for coming bro