that's because I am smarter...haha..(bad joke)... let me explain then: "Hermaphrodite is unstable in species that have a high rate of interbreeding and mate selection." Hence hermaphrodite in worms is stable. Male and female states would be less stable because of the need to find a compatible mate. " i shall translate your statement - sentence one: hermaphrodites are stable in population that doesn not interbreed sentence two: hermaphrodites (worms) are stable because they do not interbreed. maybe it is more a tautology or self-fulfilling prophecy than a chicken or egg statement (in hindsight).