That's certainly our core drive. To ensure the survival of the species. Is that really a 'meaning' though? In any case, the wrinkles in the plan haven't been ironed out. We've been so good at reproducing ourselves and surviving that the planet we rely on for our very survival is buckling under the pressure. To the extent that we may very well drive our own extinction- which we know and yet, we still keep reproducing. For the dominant species, we're pretty dumb. Plus, in any case, we can predict the sun will die and destroy the earth at some stage regardless.
I'm not sure the drive to reproduce is really a meaning exactly. It's simply another need we have evolved to have. Just like drinking when we are thirsty. Drinking isn't a meaning. It's simply a solution to feeling thirsty. F*cking is a solution to feeling horny.
I suppose the choice to bring children here can give parents a sense of meaning but ultimately, aren't they simply following primal urges?
I think 'meaning' is a very human concept. I doubt trees or dogs contemplate whether their life is important enough to have meaning. It seems more like they just live.
If 'meaning' is a human invention then surely, human values could adequately apply. Maybe someone feels their 'meaning' is to discover, invent or create something new. Maybe to make those around them happy, or to rescue animals. Alternatively, we're free to feel like our lives have no meaning so, either live hedonistically or, don't bother to do anything because, nothing has value. I think it's a personal path.