> They must have been advantageous in some past situations in order to be passed on so much, or at least not selected against. Right? No. Evolution only requir

> They must have been advantageous in some past situations in order to be passed on so much, or at least not selected against. Right? No. Evolution only requires that you get to breeding age and have viable offspring. It doesn't care about how you feel, or what happens to you after you've bred. As long as the general population of an organism can get their offspring to a viable independent status, it doesn't matter what happens to you. As a results, traits don't have to be beneficial to be passed on; they just need to allow successful breeding. Look at the male insects that are devoured by their females on mating. Once they've mated, they're not necessary to getting the offspring viable, so it doesn't matter to the continuance of the species that they immediately die.