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A cross-sectional design is the same as a longitudinal but the latter takes longer.
Recycled Plastic
Plastic materials that have been collected, processed, and manufactured into new products after being disposed of as waste.
Polymers
Large molecules made up of many repeated subunits, known for their diverse properties and uses in materials science.
Domestic Petroleum
Petroleum products that are produced, processed, and consumed within a country's borders.
Bioplastics
A type of biodegradable plastic derived from biological substances rather than petroleum, often used as an environmentally friendly alternative to traditional plastics.
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