So this theory explains why the snails have sex, but it doesn't so clearly explain why the worms have sex -- since they are the parasites in question.
I don't know why there has to be just one reason that organisms have sex. If there's anything we know about biological systems, it's that most structures serve multiple functions.
So this theory explains why the snails have sex, but it doesn't so clearly explain why the worms have sex -- since they are the parasites in question.
I don't know why there has to be just one reason that organisms have sex. If there's anything we know about biological systems, it's that most structures serve multiple functions.