Final answer:
Biodegradable bags are made of polymers and natural fibers, which allow them to decompose naturally over time, unlike traditional plastic bags made from synthetic polymers that persist in the environment.
Step-by-step explanation:
Biodegradable bags are typically made of polymers and natural fibers. These materials are chosen because they can break down in the environment due to natural processes. Traditional plastic bags, on the other hand, are often made from polymers such as polyethylene, polypropylene, polystyrene, and polyvinyl chloride, which are not readily biodegradable and persist in the environment, potentially causing pollution in soils and waterways.
When exposed to natural conditions, biodegradable bags decompose into harmless substances like carbon dioxide and water. This is in contrast to non-biodegradable plastics, which can remain in landfills and contribute to environmental pollution. Natural fibers in biodegradable bags help facilitate this breakdown process, making them a more eco-friendly option compared to bags made solely of synthetic polymers.
The correct answer to the student's question is b) Natural fibers.