✔ 最佳答案
That depends on whether you believe in determinism or not. This is more of a philosophical question than a biological question, so if you don't mind, I'll move it into the Philosophy section to help you get better answers.
Determinism holds that all events and conditions are the direct result of earlier events and conditions, and that there is no other way things could have turned out. There are many flavors of determinism, but they all seem to hold in common the idea that there is only one possible stream from past to present to future, and we're all in it. In that case, then yes, you were guaranteed to be born because your birth was part of a string of inevitable events set in motion at the beginning of time.
The opposite of determinism is indeterminism or nondeterminism, which holds that certain events are not caused deterministically by prior events. In other words, some events can happen by chance, without any apparent cause. If the universe is nondeterministic, then your birth was *not* guaranteed; in fact, *nothing* is guaranteed.
So...pick your philosophy. I hope that helps. Good luck!