The skin is the largest organ of the human body with multiple homeostasis and defence functions, its tensile modulus ranges from $25$ kPa and $140$ MPa. A biotechnology company is searching for a biomaterial for developing a new electronic skin product as a prosthesis, which will have the following functions: $1)$ high stretchability$/$malleability; $2)$ self$-$healing $($after damaging chemical bonds$)$; $3)$ haptic sensing capacity.

Propose a candidate biomaterial from one of the three category materials: metal, ceramic and polymer, which meets all function requirements. Critically discuss the atomic$/$molecular structure of the selected material to link their high stretchability and high reactivity compared to the unselected materials. Draw schematic curves to demonstrate the deformation properties of the three category materials when a tensile force is applied to each of the rectangular specimens $($the same rectangular dimension of $10$ x $30$ x $5$ mm$).$ Extract at least three parameters from the curves which can quantify their mechanical properties; explain the different shapes of the three materials by their deformation mechanism and chemical structure; suggest one technique to increase the strength of the three category materials respectively and justify the selection.