This is a fun, hands-on lab that can be done at a low cost at approximately 50 dollars for a class set (not including scales), which can be reused for multiple periods and over several years.Materials that are needed:bowlscupsplastic spoonsdrinking waterscalescupcake liner papersodium alginate (purchase on Amazon.com)calcium lactate (purchase on Amazon.com) How to Use:You can use this lab to start or end a unit on the following topics: cell membranes, plastic pollution and sustainable packaging,