Question

what proves that sex determination in snails is not genetic

Answer 1

Snails that are held near one another may experience sex change with only a straightforward touch. Huge male snails change more quickly than smaller ones and the change is activated by contact as opposed to complex synthetic discharges.  

Sex change isn't something extremely surprising for a few creatures. Indeed, numerous species experience sex change eventually in their lives, especially subsequent to achieving a specific level of development or size. Snails called shoe limpets are brought into the world male, however they transform into females later. Sex change is accepted to be activated by visual, conduct, and chemical variables.