Well necessities of survival and instinctual knowledge such as reproduction and protection is of course one answer. But I guess it depends how you look at it. I wouldn't say that's the meaning of life because that isn't meaning but simply actually living.
But of course it could be there is no meaning to life. But I still think it is quite arrogant of humans to think they themselves have meaning in such a grand universe where they are only one speck in it. So maybe living is the meaning of life but your meaning would be how you live it. And if how you live is only through basic necessities (primal needs) then so be it. I'd like to think given the human's capability of rational reasoning that I can make so much more of my own life and give it my own meaning.
But if you are looking for a base meaning of life that is equal for all humans, then maybe primal needs is that. Or you could even say that "happiness", as Aristotle would put it, being the ultimate goal of man. But this is of course a deep philosophical question that I obviously can't answer in one post nor ever answer. But that is the way I look at it. I don't know what the meaning of life is for humans or for myself but I know I have the capability to give my life meaning.
