Species which reproduce parthenogenetically and sexually have the best of both worlds - enjoy the advantages of very different things at the same time.
Mr Hendrickson, who regards Gregory as a tainted witness, concedes the possibility of a certain amount of sexual role-swapping between Hemingway and his wives.
More than 80 different sexual vertebrate species — including Komodo dragons and certain kinds of turkeys, pythons, and sharks — have surprised us by occasionally reproducing this way.
This cycling between sexual and asexual phases is called the alternation of generations, and it helps keep plants flourishing, from Granddaddy Succulent to Great-grandbaby Succulent — and even beyond that.