Does survival require selfishness the leap?

Living beings, like us, no matter where we come from or where we develop, try to survive in one way or another. It's the only part of our nature that we can't change. Survival requires selfishness, but also intelligence, which doesn't make it wrong. Survival doesn't require selfishness if your life is at risk just like that of others, if you're really struggling and doing everything in your willpower to survive.