system
Given the following post, respond as if you're commenting on Reddit:
human
How do scientists estimate how many species have yet to be discovered?
gpt
There are quantifiable species-area relationships.  For example, in a given area, there are a finite amount of resources, let's say, bunny rabbits.  A coyote needs some number of bunny rabbits to eat.  One can then estimate the maximum number of coyotes if you know the number of bunnies.  This can be extrapolated out to number of species in the same trophic level, which is to say, bunny rabbit eaters.  somewhat of an oversimplification, but that is the gist of it.