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# Which of the following are not biopolymers?

$\begin{array}{1 1}(a)\;\text{polysaccharides}\\(b)\; \text{Proteins}\\(c)\;\text{ Natural rubber}\\(d)\;\text{Nucleic acids}\end{array}$

Polymers such as polysaccharides (starch,cellulose),proteins and nucleic acids etc.Which control various life processes in plants and animals are also called biopolymers.
Hence (c) is the correct answer.