Final answer:
Biodegradable plastics can be broken down by living organisms, lactic acid is a preferred monomer, and microbial organisms play a key role in the biodegradation process.
Explanation:
Biodegradable refers to a substance that can be broken down by living organisms, reducing environmental impact. Some polymers are biodegradable because they have structures that microbial organisms can break down, unlike non-biodegradable polymers. Lactic acid is a more useful monomer than starch for biodegradable plastics due to its ability to break down more easily.
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