Why are compostable materials also classed as biodegradable?

Compostable products are made of organic matter, so they contain natural molecules that will naturally biodegrade. This is because bacterial microbes are attracted to natural molecules as a food source. When they do consume these molecules, the residue is still natural matter and therefore less damaging to our environment. A compostable material is naturally biodegradable and the residue does not harm the ecosystem (plant matter returning to the soils as plant matter). PLA (Polylactic Acid) is made from corn starch or sugar cane (biomass products), and these natural molecules will biodegrade.

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