Asking (evolutionary) Atheists & Biologists?

Question 1- In biological mutations how did some species evolve with inter-dependency and some with in-dependency concerning nourishment of their offspring post-natal period?

Question 2- How did their instincts even align to observe the change of offspring needing nourishment? In other words how capable are random genetic mutations aided by natural selection to induce responsibilities to wean & care toward offspring?

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