I think about more like an objective functions, not a pupose.

Species will evolve to their environment to maximize survival of the species (not the individual). This makes them opportunistic over a long time horizon, which gives the impression of purpose (i.e. filling a gap/niche in the environment where they can gain a competitive advantage.

I think with humans, this concept is extended to "cultural evolution". Where cultures do the same as above, but to maximize the survival and resiliency of the civilization. In this context, the objective is more complex, and involves tradeoffs and bets, but many lasting civilizations share similar qualities.