The best explanations I have found are at www.sanibelseaschool.org/experience-blog/2015/11/5/Sand-Dollars-dead-or-alive


Sent from my iPhone

> On May 16, 2017, at 3:28 PM, Cathy Scott <catsatbow at gmail.com> wrote:
>
> I was curious if you did the life test on the Sand Dollars, before gathering them, to make sure they were dead.
>
> Cathy Scott
>
> Sent from my iPhone