Question

Why are some substances biodegradable and some non-biodegradable?

Answer 1

This is because the enzymes and bacteria that decomposes waste can only break down natural substance into simpler and non-harmful substance...They cant break down man made or factory made items into simpler items.

Answer 2

some substances are biodegradable while some are not because the bacteria cannot break it down and mix it with the soil and they are also not naturally obtained .