i think the 'meaning of life' is to survive and pass on your genes. evolution has alot to do with the meaning of life as it dictates what lives and what doesn't.
an example of this would be to look at an animal such as the hummingbird. the only thing they ever do is drink nectar to keep their wings flapping. why, because they would die of exhaustion.
this would cause hummingbirds to eventually go extinct. the only reason it wastes its life is to survive and breed to have offspring to carry on the species. life has no general purpose but to survive. it really is quite a random thing that were here today as the conditions needed for life are quite spontaneous and have only been found on earth at present. even though they have found water on mars i the conditions still aren't perfect. there is no real meanig to life as it is to random to have logical meaning. the only thing that matters is that were living now and should make the most of it.