What function in nature would make it important from a Materials Science viewpoint

What function in nature would make it important from a Materials Science viewpoint.

 

 What aspects of the natural material or structure give the unique behavior?

 

 Do the properties of the material or structure come from nanometer‐scale phenomena?

 

 Give a possible application of a material engineered to mimic the biological property.

 

 Speculate on how such a structure might be made and tested.