What characterizes bio-based polymers?

Bio-based polymers are characterized by their origin from renewable biological resources, such as plants, animals, or microorganisms. This makes them distinct from conventional polymers, which are typically derived from fossil fuels or petroleum. The use of renewable materials helps to reduce reliance on non-renewable resources, contributing to sustainability and a lower environmental impact.

In contrast, choosing options that state they are derived from petroleum or synthesized entirely in a laboratory misrepresents the very nature of bio-based polymers, which inherently rely on natural sources. Additionally, the notion that they only contain synthetic additives contradicts the principle of being bio-based, as these polymers often incorporate natural components rather than relying solely on artificial substances. Hence, the defining characteristic of bio-based polymers is their derivation from renewable biological sources.