system
Given the following post, respond as if you're commenting on Reddit:
human
[Mass Effect] Transitivity of "species" definition over Asari

Since in biology "species" is defined as "members of which can produce fertile offspring together", and Asari can produce offspring with every race, does that mean that technically, every living being in the galaxy is of the same species, by transitive property over the Asari? Or does "species" mean _every_ member has to be capable of mating with every other member (of a different sex)?

What would a more appropriate definition of "species" look like, in a galaxy where "can create fertile offspring" is not transitive?
gpt
The asari don't truly mate. Rather, they use the biological data of their partners, of any species, to randomize their own chromosomes when they reproduce. Their species is reproductively parthenogenic. They just take "mates" to improve the chance their children survive, but the "father" does not enjoy the benefit of seeing his genes passed on.