Natural environment to force evolution to Immortality

Which natural conditions are needed to force the evolution to immortality? I've read on a page (I don't remember the page) that if the environment is safe, the animal would evolve to have a shorter lifespan and large amounts of offspring and if the environment is dangerous the animal would evolve to have longer lifespan and small amounts of offspring, because it's too complicated to take care of a baby animal in a dangerous environment. But I've read on other site that the more dangerous an environment is, the more offspring would be produced to increase the chances of survival of the race.

So my question is: which natural conditions are needed to force the evolution to longer lifespan and even immortality?

Bonus: Which natural conditions are needed to force humans (humanoids) to evolve to immortality?

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Natural environment to force evolution to Immortality

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