Im doing a bit of worldbuilding involving some molluscs in an alkaline lake.
I read that plastics are resistant to base corrosion and later that some plastics such as polyethylene can be produced using organic materials such as ethanol from fermentation. I was thinking that these molluscs could ferment consumed plants and produce polyethylene in their bodies to create a base-resistant shell that would help them survive.
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Along with some other adaptations, I am wondering if they could viably develop shells made of a material resistant to base corrosion and would like some real life examples.


Now that I think about it I think I just threw the term “plastic” in because I thought it would give a rough area of inquiry because I read that “plastics” were base resistant.
Actually scratch that; what I was ultimately trying to find out was some examples of base resistant biological building materials, not necessarily plastics.
Apologies for being confused about terminology; I just finished my first year of chemistry