What breaks down food molecules cell wastes and worn out cell parts?
it's not the mitochondria, it's lysosomes.
mitochondria is composed of proteins and enzymes.

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Define cell wastes?  What are parts of a cell?  Which cell breaks down food?  How do cell get rid of wastes?  What parts of a cell make food?  What breaks down food molecules?  Breaks down worn out organelles?  Which cell breaks down molecules?  What recycles worn out cell parts?  Breaks down materials in the cell?  Breaks down food molecules in cell?  What breaks down food molecules in cells?  What breaks down food in the animal cell?  What breaks down food molocules in a cell?  What is ridding of cell wastes in sacs called?  What is useful for destroying worn out cell parts?  Where does food go after it's ingested by the cell?  In a cell what breaks down food molecules to make ATP?  What moves wastes from inside a cell to outside a cell?  Which organelle helps in digestion of worn out cell parts?