Are onion peels and eggshells non-biodegradable? Why or why not?
They are biodegradable. biodegradable |ˌbīōdiˈgrādəbəl| adjective (of a substance or object) capable of being decomposed by bacteria or other living organisms. Bacteria, fungi, worms and other living organisms can break onion peels and eggshells down into smaller pieces, eventually breaking them down into very simple molecules like carbon dioxide (CO₂), water and simple biomolecules like sugars.