chemicals and genes control species identity and sex

According to latest' NATURE' magazine ;scientists have proved that chemicals and genes control SPECIES IDENTITY ;SOCIAL BEHAVIOUR;COURTSHIP;MATING;AND SEX IDENTITY

SO THE QUESTION IS IF IT ALL HAPPENED AS PER DARWINS THEORY THE SPECIES WONT HAVE SURVIVED EVEN ONE GENERATION

THIS AGAIN SHOWS THAT DARWINS THEORY DOESNOT EXPLAIN EVERYTHING ABOUT SPECIES