Those are questions of metaphysics, and you’re right they can’t be answered by science. But you have to ask yourself, if they can’t be answered by science, that is they can’t be measured or falsified, then what meaning do they really have? If you think of an unknowable, non-interventional god, their existence is the same to us as not existing, so it has no meaning. Same with any meanings of life, or questions about whether we live in a simulation perhaps, anything you can’t measure is just a story essentially, until you can measure it.