sentences: the development of new traits in a species occurs when a unique combination of traits is passed down from some members of that species to their offspring
docs: evolution has effect_of_creating_new_species intractability is trait. hallmark_of_different_species is inability_to_mate_and_reproduce. offspring is relative. babies is offspring. embryo_development is development. recruit is newcomer. people has offspring nature is trait. offspring is consequence.